400 SBC Chevy - 1.5 OR 1.6 Rockers What will make more power?? Dyno tests Last Episode of the build
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- čas přidán 14. 10. 2023
- Final Episode of my 406 SBC Chevy Build
We return to Watter’s dyno and make several pulls and changes to maximize horsepower and torque. This engine is available for sale, and can be yours. - Auta a dopravní prostředky
Nice job guys - a true 500 hp street build!
David Vizard
Thanks you for your comment David. It is an honor to have you comment on my channel. I have read your books and watched your video's, and learned a lot from you. AG
500hp in a street engine isn't hard at all nowadays. It really isn't. You don't have to be David vizard to do it
Im peggys husband, on my 400 sbc dyno run with an air gap i used a 2 inch 4 hole spacer, modified by cutting the bridge out between the 2 holes on the passenger side so that it was an oval shape. What it did, was equalize the plenums, because pass. Side is shallow, but drive. Side is deep. Engine sounded different and with jet change 20 hp. More !!
Thanks Peggy's husband. Looks like you put some detailed thought into this and were rewarded with good results. AG
I've been doing that for quite a while it always works, good job for figuring that out!!
Could you elaborate? I don't understand.
Thank you for the info !!! Been following Golds for a while now just getting to the older videos!
you take a 4 hole spacer , cut the 2 holes on the passenger side so they look like an oval it allows more cross atomization which the passenger side of a dual plane needs because it lacks volumetric efficiency due to it being shallow driver side is deeper allowing driver side to move more air and fuel
527ft/lbs out of 406 cubic inches! Very nice.
Thanks Roger. We were pretty happy with the results. That is 1.3ft/lb. of torque per cubic inch. AG
It was great meeting the whole crew and watching some of the pulls go down! 406 looks and sounds great! Would be a blast in my 84!!😉👍🏻
Thanks Squardup. Yet it would work great in a pickup. AG
Please give Gold's Garage a "LIKE" if you have any appreciation for what he does!
And thank you Allan Gold for the 2 video's this week, and all you do!!
Hey, thanks for your support Alleyoop, what a nice compliment. AH
Cannot imagine why you didnt start with a 750 cfm carb ? David Vizard would tell you that camshaft is way off of what is needed. Should have a 105 LSA would make more power thru out the RPM range Probably another 30+ HP
Sounds beautiful, Allan! I hope mine is next! 🏆
Thanks William. Maybe we can do a video of the tear down next weekend. AG
Thank you for the video
Keep 'em coming !
Thanks Nerrad. We will do that, lots of good content in the pipeline. AG
I loved the subtle changes and number of pulls for comparisons. 👍
Thanks for your comment Randy. We made 11 pulls and I think there is still a little more in the engine. I was happy to get reach my goal of 500HP.
@@goldsgarage8236 I was most impressed with the torque at 2000 rpm and the swap to a 650 carb.
I have a friend with a sweet, pristine 70 1/2 Z-28. I think the factory Holley was only on this year Camaro. I think 780cfm. More than enough for 350. Nice bragging rights, but it too would be better with the 650.
His car is probably cleaner, even on the underside than when it was new.
Thanks Randy. The 67-69 Z28's came with an 800CFM carb, they used the same carb as on the L88427. Not sure about the 1970Z's. Remember GM built these cars for Trans AM road racing and they were spun to 8000RPM. The smaller carb will give better throttle response on the street. AG
@@goldsgarage8236 The 1970, or more commonly know 1970 1/2 Z-28 with a 350 came with a 780 Holley. I think it was special for this year only, I could be wrong. This was the last year of high compression. The Z-28 option had 11:1 compression.
I'm only familiar with some specs on this particular year because a friend has one. The car was in Chevy High Performance magazine many years ago. It stays parked in a garage and covered.
I think a lot of manufacturers in that era played with guys brains by having those big carbs. That said, big is always good for bragging rights. 😁
Very nice, respectable numbers.
Cheers🙂
Thanks for your comment Franc. AG
Great job guys 👌
Thanks Joe, we were pretty happy with the results. AG
Super nice 400
Thanks Patrick. AG
She sounds great!!!! What a beast!!!!
Thanks Hugh, we were pretty happy with the outcome. AG
Nice job!!!
Thanks for your input as always Eric.AG
Nice job 😊
Thanks Mike. AG
Love your videos.
Very nice compliment, thanks User. More to come. AG
Thank you for your knowledge and video's USA 🇺🇸 💪🏾
Thanks' as always Patrick. AG
Awesome video! I built a almost identical 406 last winter but used the project x promaxx 200cc heads and very close cam to yours with the 1.6 rockers. Mine also was 11:1 compression and it is a blast to drive out on the street in a 1972 c10. I didn’t dyno mine so it’s nice to see what kind of numbers it made. Keep up the great videos and you have lots of good information in them.
Thanks for your comments User. I think your 406 would be about the same. AG
Really good video I have been wondering if the rocker ratio change would be beneficial or not so I'm glad to see you did this test and had a gain in power. Thanks for the videos
keep it between the ditches
Thanks' Trigger. Now we know, that's why we test. AG
I like to say keep it between the mayonnaise and the mustard 😂
20:40 ah no pull with the 650 shown? Bummer. Cool engine, been waiting for this one! Keep em coming.
Thanks for the comment. Sorry about that. By the time we installed the 650 we already had enough videos of the pulls. Guess we could have added one more. AG
Sounds like you nailed it basically when you chose the cam. Didn’t need any more help from rockers. That says something.
Thanks Gary, That is an astute observation and by the results I would say you are correct. AG
Heads were already doing all they could do!
I’d agree with that also. Head flow, valves, etc were all maximized. But would a higher flowing head increase top end power WITHOUT loosing torque because that was the end goal.
Nice engine, great power. I'll take it
Thanks Chad, its still available, $10K USD.
Thanks !
Hey, you are welcome Lparsons. Glad you enjoyed it. AG
Good info
Thanks JOM. AG
The 1.6 rockers helped by getting the intake valve off the seat faster making it seem like it had a larger intake valve. Helping scavenging would have like to see if 1.6 on the exhaust would help too. With the larger ratio rockers improving power leads me to beleive the lsa of the cam is to wide for max power. But it will be easier to tune and drive on the street.
I never got the point of not doing both intake and exhaust other than being cheap.
Thanks Vesta. The cam is 110 LSA, and yes probably about 106 would make more power but you are correct, 110 is good for a street cam. AG
Surprisingly in many builds leaving lower ratio rockers on the exhaust delivers more torque which is what power is based on. For a street engine low RPM torque and a flat torque curve is the bees knees. For speed trials like Bonneville Salt Flats, HP at high RPM rules. The only way to know on any build if increased rocker ratio will be an aid is to test on a dyno.
@@____MC____ seems most times engines are either over valved on exhaust, over duration or both as cams usually designed to work with stock or near stock poor flowing exhaust systems, when open exhausts or better exhaust systems are in place then more inlet valve velocity has a positive impact on performance without any changes to exhaust side, just my general experience, I heard Darin Morgan say similar comments on exhaust valves in performance heads too
You could try an edelbrock VRS 850, or maybe on that boat engine seems like they make tuning really well and driving easy with more leeway. Cool Vizard video also.
very cool
Thanks Ube. AG
It's an issue few would ever face, but I managed to take out an electric water pump by neglecting to remove the ratchet after lashing the valves. (once) Now I remove the ratchet after each turning of the crank.
Good observation Yarrda. I have left it on there a few times, usually it just falls off. Luckily I don't have an electric water pump. AG
Been there Now I have a note to remove ratchet right on my cam sheet.
Yes, I thank everyone... AG.
Thanks Leonard. I am fortunate to have some great people supporting me and what I do. We had a fun day. AG
With an estimated 460 lb ft at 2,000 rpm, it sounds like it would work well in a 1/2 ton hauler with up to 12,000lb GVW. Even in the up to 9% grades we have here in BC!(Which I usually climb the big hills at 2,500 with a 350)😉
Thanks Alleyoop. Correct, I used this cam because I don't know where the engine is going so I wanted it to work in a wide variety of applications. AG
Stick it in a Nova.
Super! I am going to have to re think my ideal engine 454 gen VI.
Thanks for your endorsement Richard. AG
454 gen IV
@@robertbriggs4176 do the BB the torque is unreal.
Nice 👍
Thanks Treetop. Good luck on your projects and videos. AG
Thanks buddy..you too
Badass
Thanks' Paul. AG
Hey good video. I was looking and it looked like you have self aligning rockers and guide plates.
Good catch Thabiznizz. Not necessary but they work fine together. Just that the heads came with the guide plates and i had the rockers in stock. AG.
Thanks. I enjoy your channel. You have a good combination there. That’s going to be a great street engine for someone. I have those same heads on a 350 in my S10. Been running them almost a year now. I never leak down tested them though. They seem to be doing good so far. I was thinking about doing a 400 short block so naturally your build caught my interest. You gave me a good idea of what to expect. Those are good hp and torque numbers.
I have watched some of your videos and will watch more when I need to turn a crankshaft I use a adjustable wrench it doesn't mark the crank it grips the woodriff key
Thanks for your comment Blacktop. AG
They make crank sockets just for that purpose
Take the 1.6 off the intake. Put the 1.5 back on the intake.
Put the 1.6 on the exayst and run it.
Then put 1.6 on all of them. Run it and show us the dybo on all three runs.
Graphs preffered
Too late for this one, but we will do more testing. AG
Aluminum heads may be different, but with stock heads, we found an improvement with 1.5 on the intake and 1.6 on the exhaust over 1.6 on both. I am assuming it helps with the limited exhaust flow of the unported cast head.
Thanks Leland. The 1.6 should help in a car with a restrictive exhaust. I think that is why cam companies make dual pattern cams with more lift and duration on the exhaust. AG
@@goldsgarage8236 even on the dual patterns it worked well. We never tested on aluminum heads though. It would be interesting to test.
I have seen a number of dyno tests that indicate best results with higher ratio rockers on the intake. The intake on a NA engine operate with at best atmospheric pressure in the port, while the exhaust has about 100PSI in the cylinder at EVO which allows the exhaust to function well with smaller valves and lower lift. Depends on the specifics of the ports and the rest of the engine.
Nope! Atmospheric pressure at the intake port?? Yes! When the engine is turned off! But When its running the piston travels down creating a vacuum and sucking air in... same.piston speed as when exhaust is pushed out just the other direction
@@1DEADBEEF1Reread my post. When the EVO's there is still in the neighborhood of 100PSI in the cylinder that initiates blowdown and the pressure wave in the exhaust.
I believe physics say you can push air but you cant pull it. Imo the intake charge is not sucked into the cylinder, atmospheric pressure fills the void/absence of pressure created from the action of the piston decending. Atmosphere can fill a vacuum/absence of pressure very fast near the speed of sound.
@@stevenbelue5496This is true. A "magic" number for head porters is 300 feet/second in the intake port with 28 inches of water depression. Now in a running engine just as the intake valve opens, the pull of the exhaust pulse during overlap, can create over 100" depression across the barely open intake valve. As the valve opens more air passes causing the depression to drop even as the piston velocity increases. Maximum piston velocity occurs at approximately 70° ATDC and BTDC.
Exhaust velocity is highest at EVO due to the residual cylinder pressure, which is approximately 100PSI. This creates a high pressure supersonic pulse out the exhaust which is higher pressure and velocity than what the piston creates as it rises on the exhaust stroke.
The intake is restricted and cteates pressure drops to the atmospheric pressure from the air filter construction, throttle position and friction with the port walls. The closest to atmospheric at the port side of the intake valve would be low RPM and high load, wide open throttle.
Thanks for your comment and detailed information Dale. Sounds like you have a deep understanding about what is going on in the engine and have started some good discussion. AG
Glad you set the valves correct, you took the slack out of the threads the way you tighten them down AG.
Thank Leonard. I decided to do a clip on this because there is a lot of confusion out there on this point. Glad you agree on my method. AG
Those AFR Enforcer heads are the real deal. I figured that they would end up being just another mediocre cylinder head like all of the other ones but these perform like the more expensive ones do.
Thanks Robert, we were pretty happy with the end result. AG
They are nothing special. Most the knockoff castings, nkb etc might see 250/180ish
Like a ported set of camel humps
Nowhere near the quality of head as thier eliminators hence "cheap"
I know, I got 2 pairs, stock and ported/flowed. Huuuge difference.
Nice engine..... im surprised this dyno doesnt use an 02 sensor to help fascilitate proper AFR numbers.
Thanks Big. Darrell's dyno measures air flow through the hat and then fuel flow to front and back barrels, then does the math to get air fuel ratio separately. AG
I like to change pushrods if im
using the 1:6 rockers
Thanks Steven.AG
AFR heads and most modern heads have efficient combustion chambers and dont need that much timing advance. They are not like old sqaure chambers. 28 to 32 is all you need.
1.6 rockers work well on stock or near stock cam. They're a crutch to make a small cam act a bit larger but the law of diminishing retunrs sets in hard with cams in the above 220's. Then you also start the risk of vavle float.
Thanks for your comments Ics. AG
That isn’t true. The combustion chambers are pretty much the same shape and sizes since the 60s what’s become more efficient is the increases runner sizes and ability to flow more air making them more efficient. Most of the new heads still running same 2.02 1.6 valves they ran 50+ years ago. Yes you can use 1.6 rockers to help with a smaller cam but they’re not a crutch they’re an option that can be beneficial or not depending on many factors but they are not causing valve float. You can float valves with 1.5 just the same when you get rpm’s up to high. It all depends on the valve springs. But in reality the only thing causing valve float is the operator.
That is fake news. But dont take my word for it. Call AFR and discuss it with them. They did the research and design and they will tell you the same thing. I know because I have done the same engine with the same heads and called them to ask. Look up and research heart shaped combustion chamber and all the related properties and benefits that design. The LS chamber was adapted and reverse engineered in this regard. @@Thumper68
@@icsamerica the chamber has always been heart shaped it’s just been improved over time and with better building technology but it’s nothing new. And I don’t need to call AFR my old man’s a master machinist and mechanic for 50 years and been building 700 hp sbc minimum 35+ years being some of my first memories.
@Thumper68 100% wrong. Go look at the chamber of a set of fabled camel humps or just about any other SBC heads before the Vortec design. Hint... it's not heart shaped like every modern high performance SBC / LS is head now.
38 degrees is a lot of advance I’ve found 35-36 seems to be the number for majority of sbc.
Thanks for your comment. AG
Smart choice by not putting the 1.6 rockers on the exhaust AG...
Thanks Leonard. AG
My guess that there is 520 hp in that engine if you would balance the A and B of the carb. What you needed to do was lean out the A side and richen up the B side until both sides of the carb is flowing the same amount of fuel. Looking at the dyno sheet you have over 20lbs of fuel difference. They need to match.
Thanks for your comments Racer. I agree there is more in the engine. Darrell did do some jet changes to balance the flow but by the time I changed rockers and I got my 500HP target we were running out of dyno time. Your comments make good sense and next time I will focus more on that from the start. Thanks for your input again. AG
A and B meaning Primary,/secondary I assume?
Yes, the Dyno has fuel flow meters marked A primary B secondary, @@randywl8925
@@randywl8925No, high side and low side. Dual plane manifolds split a V8 in half left to right. 180° pulse versus 90° with a single plane. Basically fuel distribution related.
So what’s up why didn’t you ever donthe 1.6 rockers on intake and exhaust and show the final results
Nice engine, i could bring the power to 550hp 540 torque by a cam swap. If the cam was something like 241 244 590 590 lift on a 107 lobe this engine would make 550 hp and close to that in torque.
Thanks for the comment. You are correct. I am pretty conservative on cam selection. Drivability, throttle response, low end torque are priorities in a street car. AG
Il@goldsgarage8236 I do agree, however I'm always surprised how well these 406 motors suck up a big cam. I have a 406 in my 63 biscayne with a 247 253 560 540 on a 106 and the holley fuel injection works perfect even with only 9.5 vac. Flat tappet solid old school budget build.
How much are you asking for the motor?
I love the fact you tested the 650 carb on that motor, it actually proved something I had been debating. So often car guys run too large carb, A 650 will support 500hp.
Thanks Cuzz. I am asking $10K USD. AG, less than $20./HP.
@@goldsgarage8236 That is a fair price for a proven piece tested ready to go
Spent 18k on a 383...coulda done it for less but I skipped no step and love shiny stuff.
Curious...why not change both intake and exhaust rockers to 1:6?
Good question Rick. We didn't gain much be 1.6 on the intake with this combination and we felt that we were already over scavenging on the exhaust already. We were also running out of Dyno time. AG
Is there an advantage of using 1.6 rockers instead of just specing a bigger cam to start with?
Very good question Robert. Camshaft lift is limited by duration because there are limitations on how fast the cam can lift the valve. More duration may not be desirable because it can cause loss of low end torque, idle quality and overall Streetability. Lift helps everywhere with none of the negative effects. Using 1.6 rockers allow more lift without increasing duration. Hope this helps. AG
Just to clarify the first run was a 850 brawler carb out of the box?
Yes it was
Where is the link to buy the motor? I’d like to check it out. Thank you
Thanks for the question Shilo. It is for sale on Kijiji. You can also contact me directly at 226-980-7499.
Is there a website link or additional add on this engine or just call?
Thanks for your interest Jacob. It is listed for sale on Kijiji. You can call or test me at 226-980-7499. AG
VE went up with the 650 ? why, coz it flowed less air ?
Also if we're so afraid of over scavenging even with the little cam, why not fit a single pattern cam, it'll make less power but you won't be worried about "over scavenging" is that a fuel economy thing ?
Good observation Tom. I think most street cams are dual pattern because the exhaust flow on street engines is usually restricted by mufflers etc. AG
What’s the top speed of this thing 🤔 ?
Great motor. A victor jr would get you 25 more hp
not necessarily you watch to much Eric it only out performed the newer Victor JR by 25 HP the old Victor JR was the best by 6 HP over all out of the rest of the manifolds tested, watch again.
@@fredlogan3849 PROVE IT.WHY HAVE ALL THE STOCK CAR LOCAL SPPEDWAYS RUN VICTOR JR FOR ALMOST 50 YEARS. IT WORK. IDONT KNOW ERIC YOU ARE TALKING ABOUT. I BEEN AROUND 50 YEARS DOING THIS. WHAT ARE YOU REFERENCE I SHOULD WATCH ??
Thanks for your comment Hank. AG
@@hankclingingsmith8707 Well street cars dont operate in upper rpms only like a st car.
The engine in this vid will feel way better with a dual plane.
Which camshaft is in the engine? Hydraulic roller?
Howard’s 110265-10 Hydraulic Roller
Leaner will almost always make more power.. richening the mixture makes it safer but will decrease power.. unless it’s so lean that it’s not running well
Thanks for the comment Mississippi. Good points. AG
peak horsepower at 5800 rpm is a great street engine.
Thanks Andy, Merry Christmas. AG
Making 500hp is easy nowadays. I'm guessing the 1.5 roller rockers.
Thanks Musclebone, the 1.6 on the intakes only added 5HP about 1%.
When and if do you break in the cam ??
This was a roller cam engine so break in is not an issue. For all flat tappet cam engines i break them in on my test stand in my shop before we go to the dyno. AG
I think you left some hp and tq on the table by not putting the 1.6 rockers on the exhaust side.
Thanks Grissly. You might be right, I wish now that we would have tried it. AG
Good tattoo artist who did that work.
Thanks Thumper. It was a work of art for sure. AG
Wow, you did a great job of making a 500 hp engine, send me the cost I may be able to afford it who knows
Thanks George. There is a screen shot in the video of all the parts that I used. You will be able to calculate the cost from that. AG
This may be a dumb question, but when you're selecting valve springs to handle a certain lift, what rpm is that lift rated for? I was just watching an old vizard video and was saying that you dont need more than x-amount of spring pressure on a small block which happen to be lower than the springs i ended up getting wich had a rating close to the lift im running. It would make sense to that he may be right and the springs i chose may be good well past the operating rpm range of my 383. Im i on to something with that?
He said 330 to 360lbs
My springs are rated to 438lbs it also says its 412lbs @1.170" and my lift will bring it to 1.220". Also 136 lbs seat pressure.
Thanks for the question @___MC. We need to know more about your cam but your springs are big for a street engine. Looks like your cam is a roller, if so i would agree with DV.
@goldsgarage8236 i was under the impression that tapered springs do the same job with less open pressure and a progressive rate, so i figured i might be on the low side untill i saw that video. I dont have a spring checker, so i have no idea what pressure is a 1.220".
@goldsgarage8236 in vizards spring rate graph, the tappered springs have a pretty linear rate, so i graphed it out and got about 390lbs at 1.220 compression.
We put modern Comp Beehive springs & retainers on my World heads when we freshened up my 409 small block. Seat pressure is 105lbs & around 305lbs open running a .550" lift hyd roller cam with 1.6 Comp rockers on both sides. Beehives are more stable & a bit lighter so they control the valve train with less pressure. I've switched from 1.5 to 1.6 rockers on motors with short duration cams & have seen a noticeable increase in power, which goes along with GMs LS motor components, 200cc intake ports & cams with around 200* duration & high lift with higher ratio rockers. Best of all worlds, driveability, mpg, good power & lower emissions.
750 double pump would be the best.
Thanks Thomas. We had one too, wish we would have tried it. Ag
If I build an engine with 1.5 ratio rocker arms and.100 valve to piston clearance and change to 1.6 ratio rocker arms am I in the danger zone?
Good question Steven. Yes, I would suggest checking it. Minimum clearance occurs on the overlap cycle when the exhaust valve is closing and the intake is opening. You can check it without disassembling the engine by using a dial indicator and light checking springs. AG
So the million dollar question, whats the price of admission for the 400??
Thanks for the question Doc, I am asking $10K USD.
523 👍's up thank you for sharing 😊
Thanks Scott, glad you enjoyed it. AG
Why dont you guys use a a/f gauge ? Guessing and reading plugs….
Theres other ways of checking it which they use on the dyno
What the compression ratio
Thanks for the question. The SCR was 11:1, DCR:1, the cranking pressure is most important, 180PSI. AG
Those are forged rockers or are they billet???
GM Performance rockers are forged aluminum. AG
How much for this Engine? Or an Engine like this for my 1991 Chevy Short Bed Truck?
This engine is sold John. They are all custom made and priced. AG
498 hp to a torque converter. What does that equate to on street conditions
Thanks Dave, typically about 20% is lost between the flywheel and rear wheels. AG
How much do you want for the engine I'm very interested in it
Thanks for the question Quinten. This engine has been sold. AG
Price ? I need a good circle track 258 aluminum heads 12.5.1 dime pistons 7200rpm chip how much ?
Thanks Josh. Ballpark estimate, with all new parts, Dart block, forged rotating assembly, roller cam and stud girdle, balanced, dyno, etc. $12-14K USD. AG
What cam would be better to get close to 600 hp
Quite a bit larger Ssjay. You would have to spin it closer to 7000RPM. AG
Is 110265-10 cam with 1.65 roller rockers in 406 makes good torque and horsepower
What’s the price on the engine? Is it still available?
Yes it is still available. $10KUSD. It is back in my start up stand ready to go. AG. you can call me at 226-980-7499. Thanks for your interest. AG
Why 1.6 on intake only?
Would this also apply to stock sbc heads?
Thanks for the comment Richie. Yes, we should have tried 1.6 on the exhaust. We were concerned with over scavenging. 1.6 rockers will help your stock heads for sure. AG
Thanks for the reply.@@goldsgarage8236
Did the engine ever sell?
Yes, thanks. AG
Daryl needs a mic.
We were having some issues with interference when the Mic’s were too close together, so we tried using just one in the dyno cell. We put one on him at the end of the video.
Thanks Mike. AG
Darrell needs a mic
We're the heads flowed?
Thanks for the question Daniel. No we did not flow these heads and did not do any porting at all. Skip White publishes the flow numbers if you are interested. AG
How much stall and gear it would need
Thanks for the question Ssjay. It is going into a 4 speed car but depending on the weight of the car I would suggest 2400 Stall and at least 3.55 gears. AG
@@goldsgarage8236 79 Malibu
How much are you going to be asking for the motor? I cant😢find it on kijiji
Thanks Mattew, $10K USD. $13.5 CAN It is on Kijiji. AG
what size tubes are your dyno headers?
Thanks Jay. They are Dyno Darrell's headers.
Darrell, if you are watching, can you please respond to this comment. AG
thank you@@goldsgarage8236
On the last Dino sheet I saw it looked to me like the horsepower was still climbing at 5800 RPM, did you not take it further up in the RPM range?
You are correct Thomas. There might have been a few more HP there. We felt that we had achieved our target and we wanted to get Will on the road, he had a long drive. AG
Have you sold it yet ?
Yes, thanks for your interest. AG
So theoretically at 8,000 RPMs the crank is actually turning 16000 RPMs and you're only measuring every other revolution
Thanks for the question Scott. Think of it this way, if the crank is turning 8000RPM, the cam is turning 4000 RPM. AG
Did you say Audi lifters?
I meant Lunati lifters. AG
Price?
Sorry Jane, this one is sold. AG
Where is all the DATA of the comparison???? Come on guys step it up
Can I ask you what exactly has DV ever done in racing? At least your friend has a raced a NHRA class car, please stop mentioning DV in the same sentence as your buddy.
I’ve been reading spark plugs my entire life. You can spot check them like your doin. But you can absolutely not actually see what you need to unless you cut the spark plug. Do it right or pay the price. CUT THE PLUGS.
Ok are you 10 years old though your entire life means nothing without knowing your age.
There r better 1.6 rockers, theyre not all the same. Some lift faster off the seat
Correct Ricky, I have posted videos comparing 5 or 6 rockers through the lift range. Check them out. AG
That's not easy to do getting a holley carb tattooed on your arm. No that takes effort
You got that right Greg. a 2 barrel would have been easier but not as cool. AG
The 1.6:1 rockers not only increase lift they also will increase duration @ .050" by 2° for every .1:1 ratio increase.
The exhaust might of made a bigger difference with more rocker ratio if that's what the engine wanted? If the intake to exhaust flow ratio was on the low side for the exhaust, the extra rocker ratio would of helped. Especially after raising the flow rate on the intake side increasing flow rate ratio further away of where the engine might want it?
It might of liked more ratio just on the exhaust, now we'll never know. A decent intake to exhaust ratio you want the exhaust to flow at least 70% of what the intake flows. But you probably already know this? If it is higher then you were probably correct in not bothering to swap the exhaust rockers?
Good comments. It might have helped but since the intake change only gained 1% and I already had my 500HP target we didn't do it. Remember, the exhaust already had more lift and duration. AG
Torque was down on the 2nd run, so that meant to me they needed to spend more time tuning it.
best run 1.5 rockers 498/527
listed run 1.6 rockers 503 519.
I would have expected closer to the 527 tq on the 1.6 rocker, this would have also given more HP.
@@dennisrobinson8008
He only used the 1.6:1 rockers on the intake valves. So with the 1.6:1 rockers on both the exhaust would of been able to keep up with the extra intake lift and duration. Every .1:1 extra ratio raises the duration @ .050" by 2°.
So it was probably to much intake flow and not enough exhaust flow that probably killed the torque? If he tested the 1.6:1 rockers on both valves we would know for sure. But since he didn't, we'll probably never know? 🤷
I guess we won't know. The torque shouldn't have dropped any if much at all. So the exhaust rocker and additional tuning would've likely yielded a similar torque peak, maybe shifted to the right a smidge, but higher HP probably 10-15HP. @@itseithergonnaworkoritaint7852
Your videos have good information, but you talk way too much. Just make your point!
David Visor forgot more about sbc than you whole team will ever know