How To Install New Valve Springs in Your LS Engine
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- čas přidán 10. 02. 2020
- In this episode, I show you how to replace the valve springs in your cathedral port headed LS engine. The engine I use in this example is the LM7 5.3L in my 2000 Chevy Silverado.
Here's a link to the Comp Cams LS6+ Valve Springs on Amazon: amzn.to/39Fr5ks
Here's a link to the Proform valve spring compressor on Amazon: amzn.to/37rUg8Y
Here's a link to the Lisle pneumatic valve holder: amzn.to/2SNclsR
Check out the Lowbuck LS website here: LowbuckLS.com
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I always double check the number on the book with a paper edge for that reason! Good job with getting it out brotha!
Great video man! This is a ton of help!
Like the tool going to get one. Thanks for helping me the decision to get it.
Just ordered the valve spring compressor through your link. Thanks for the video man will save me a lot of $ on labor!
Thanks Nick!
Awesome and detailed video, thanks a lot!
Really interested in the build, new subscriber keep up the great work!
Thanks, glad you're liking the videos, thanks for subscribing!
This is the best in-depth valve spring video I’ve seen ! Well done !!
Good to see you were able to get the bolt out 👍
Phil Betthauser yeah I was little stressed out for a bit there... still a little concerned about the debris that might be in my engine as a result of drilling/welding on the head. Hopefully it holds up though.
Great video. Great information in comments as well 👍
Dude you are doing a great job.
Wallace Mccray thanks sir!
Proform's instruction were kind of vague, thanks for the help!
Neat video, thanks
This sounds stupid, but I need the step by step process to do this. I saw 1 video that had all the wrench sizes required, but I forgot to save it before it disappeared. I really like your videos, I myself have a gnc sierra. Keep up the good work!
17:41 everyone loves stickers. Great Video bud
Way to maintain your composure, I would definitely have been throwing tools
Welcome to Canada. Where you buy tools and they are junk by default. Word as advice, sometimes it's worth the extra little money to hit the matco/snapon truck.
Secondly next time you gotta drill like that use a shop vac.
But that wiring for the welder....bro that was awesome, you nailed it! LoL
Smith Tuning thanks sir, yeah it’s definitely worth spending a little extra money on certain tools. I have been happy with some of the tools I’ve bought at Canadian Tire like their “Maximum” line of wrenches but definitely should have spent more money on the EZ outs. And should have used a vacuum like you said, lesson learned.
Life saver
Stupid question... Why only unbolt the rockers that don't have tension? I'm right in the middle of a build learning as I go.
if you put the lock nut for the threaded rod bit under the bracket (you had it on top) that bolted to the head you should be able to wind down the nut a bit further and the bracket would hold the springs in place better
Nice cheers!
Good save on the broken bolt, awesome video. It sucks trying to work on anything right after a move and you don't have your garage together yet lol.
Thanks Jay, yeah got most of the tools/garage set up, just need to install a proper electrical outlet for the welder.
PAC 1218 still for the sloppy stage 2. Good find for $140-150 shipped
Do the valve spring nuts need to be torqued?
Perrrrrfeck I say, perrrrfeck. Took the valve springs out of the 3800 supercharged heads, ready for 105's now baby, here I come ZZPerformance.
P.s. new subscriber 👍👍
Hi, how much psi does it need to fulfill this job?
I talked to you before, can you please tell me the exact process to doing this?
I have the springs....and the spring compressor....somewhere.
question, im going to be changing valve stem seals that uses similiar method. so you did all the springs with just compressed air? you didnt worry about turning each piston to tdc like most valve stem videos show. is it b/c the compressed air should be enough to hold valve stems up with out worrying about pistons being tdc?
Yes you still need to turn each piston to TDC, I may not have shown that in the video, it's been a while since I did this
Valve cover bolt is 18 ft lb or 106 in lb at 25:16 ?
Why do you have to change the valve seals if they’re double springs?
I bought the pac 1219 springs. Max lift is 625 spring rate is 348. Yours only has a 580lift but your rate is 385?? Holy crap. I’m run a sum 8712 But I have 1.8 stainless steel roller rockers. What was your preload you used??
Some manufactures of springs list there spring rate differently. I had the same question when looking at stock ls6 springs at 375lb spring rate vs BTR ls6 spring at 285lb spring rate. How could they have such different rates and offer the same lift? It ended up being that the BTR springs listed open pressure at max lift .550 as the spring rate. I ended up using the LS6+ comp springs. The seat pressure for all three of these ls6 type springs is about 90lbs installed at 1.800. The open pressure is listed as 285lbs. but that's at max lift, since my cam only has .500 lift, the open spring pressure will be lower.
Pac1219 springs have an open pressure of 348lbs (@.625 lift)and a seat pressure of 135lbs vs. 285lbs open pressure and 90lb. with ls6 type springs. GMPP LS6 springs are listed as 375lb spring rate, Comp at 385lb, and summit ls6 springs at 375lb. Spring rate isn't the number to look at, open pressure and seat pressure need to be as low as possible and support the lift you're running.
Higher seat pressure is harder on the valvetrain as a whole. The 8712 summit truck cam only has .500 lift, did you use those high load springs because of the roller Rockers? The 1.8 ratio puts the lift up to .529. I know you are supposed to add some to your spring rate if you run them because of the weight. Normally less than .550 lift truck cams use Ls6 type springs to match cam profile. Overall I love my summit truck cam, it lopes great for a small cam, and runs even better. I researched springs for months trying to learn how to pick the right springs for safe maximum gain.
@@Mattvardaman. I did consider that with the stainless steel roller rockers when buying the pac springs. The weight of the rockers when engine is running puts extra momentum on the on the roller rockers. Ya. I didn’t figure in the 500lift to the maxlift of the springs. That’s a good point you make. But I knew I’d be safe from valve float because of the seat pressure and the springrate. I probably overspringed my setup a little like 90lbs shy for max lift height. It runs solid and does have a little lope chop and surge is like 150rpms. A bonus. Lol. Thanks
Did you have to rotate the crank on each cylinder putting the new springs on or just the air?
Ro 23 20 cam some guys rotate the crank so the piston is at TDC on the cylinder they’re working, on but I just used the air and didn’t rotate the crank, the valves are going to be closed anyways since the rocker shafts and pushrods are out.
Lowbuck LS yeah I kinda figured w the air you wouldn’t have to .....I was just going to make sure .....I got the ls6+ beehive springs coming in sat I already have a compression tester I’m going to use instead
@@amordewesoI installed my new LS6+ springs last night. I have a Summit truck cam in my 5.3. I used the TDC method. Two cylinders are up at the same time on ls engines. Normally one would be on the exhaust stroke but the rockers are off so it doesn't matter. You can do 1 and 6, rotate crank 90 degrees, then 8 and 5, 7 and 4, then 2 and 3.
I wrote it on a piece of paper like this so it's easier to see: 1872
6543
You can do the two cylinders that line up vertically. I used a pencil to stick in the spark plug hole to verify the piston was up. I had one valve slide down and touch the top of the piston, it's easy to slide back up. The valves can't go anywhere with the piston up. I modified my compression tester to put air into the cylinders as a back up, but every time I put the air to a cylinder it would force the piston down. I started at 70 psi, worked all the way down to 20 psi. It would force the cylinder I had at TDC down to the bottom. Just wanted to share that info if someone is doing springs for the first time.
What are those spring specs
What is the advantage of using stiffer valve springs?
Eliminates valve float at higher rpm's.
What was the reason for having to change out the Springs with COMPCAMS Spings.. ??.. Where any of the OEM Springs cracked..??.. Jus asking...
I put a different camshaft in and the stock valve springs didn’t allow me to get the full RPM range of the new cam, stock springs didn’t have enough tension. These ones allow me to take full benefit of the new camshaft
@@LowbuckLS Very good Tanks for your Educational answer.. I should have done something like this for my own Heads..
If I was this far…I would’ve change the valve seals.
How show camera on floor how deaf tech center piston each up pull hold on the valves not drop into cylinder head remove?
Can you use this tools on a 6.0 ls
Yes it will work on a 6.0L just fine
can you run them with the stock camshaft?
You could but you won’t see much benefit from them with the stock camshaft, they’re not really needed until you install a cam with higher lift than the stock cam
@@LowbuckLS okay thank you
Which way do you turn the crank over. Counter or clock wise?
Clock wise
Is your engine blown yet ?I have them in my car and the rest of the guys broke a whole bunch of valve spring from comp
No, should it be?
Only 50psi is enough? I would think you'd need more? Would a pancake compressor be sufficient enough?
50 PSI worked for me but it wouldn't hurt to go higher, a pancake compressor should work fine, it doesn't need to supply much volume.
He say 50 psi.
I have no idea why they are called an "easy out".
Rick's Garage lol yes, good point haha