What is funny that back in the 60's we all wanted to build a 301 which is the 283 bored out to a 4 inch bore. I was working in an automotive machince shop at that time. The 30-30 cam was available at the time and everyone used TRW forged pistons which is what is in the factor 302. Basically people were building what Chevy finally pieced together but advancements in all aspects of engine parts improved by the time of the Z/28, referring to valve spring and pushrod guide plates, intake manifold, carburetor, windage tray. The Melling high volume oil pump was available also. Thanks for posting this.
I am really excited about this build series. I have always been a fan of the 302. I get irritated when people think that the DZ302 was the only one built. I can't believe you guys were able to find 2 MO blocks much less with the correct dates. I have been collecting parts to build a 302 myself. I don't own a Z28 but I do own a '68 RS that will get a 302 eventually. I'm just using a 327 block, 283 crank and the heavy 283 truck rods. The first part I bought were the 11:1 TRW pistons.
Fantastic video. With all the activity and projects you have going you're going to need a bigger shop. Looking forward to seeing these engines on the dyno.
Thanks Todd, getting crowded for sure. i got the parts for Joes 400 today so i should have it on the stand this week, then to the dyno. I will have your block back next week. Watch for the cause and effect video. AG
Thanks for your comment Stuart. We will do a complete blueprinted build on each of these engines. We will rev them past 7000 like it’s 1968. Stay tuned for more videos. AG
I had some #186 69 Z-28 heads on my 302, made angle heads out of them and put screw in studs on tge heads. 2.02" intake and 1.60" exhaust valve. 64cc combustion chamber cut down to 60cc... Ran the Z-28 brown valve springs, with GM hi-performance push rods.
Hi Alan, Still working on my 296. >080 over 283 with a steel crank, H beam rods, E Street heads, 79 cam. I am having a bit of a problem getting the passenger bank to oil. Plenty of oil flow in lifter bore 8 so not sure what is up. The block is a thick casting '64 for my '64 El Camino. I won't turn it like the 302 but should be pretty powerful. I am planning on another 296, this time with a "61 block and steel crank. Probably going to go with a. set of power pack heads with larger valves to look stock. Still planning and gathering parts. Still enjoying the videos.
Hello Allen, I finally figured out the oiling problem. The motor was partially disassembled when I bought it. I finally pulled the oil galley plug and installed the distributor and could see the sealing flange on the distributor wasn't going down far enough. I pulled the oil pan, pump and intermediate rod. I called Melling to see if I had the correct intermediate shaft. The shaft I had was for a big block. I purchased a new shaft and I think all will work. I have the clean up work done and new gasket set came yesterday so we will see. I will let you know.@@goldsgarage8236
4 inch bore of a 350 or 327 what's the stroke of a 283 thus you come out with the 302 large journal, Basically a high RPM road race motor for my native American friend would say engine.
Nice.. I got a friend with a 66 titled camaro. I always assumed it was a 67 until he pulled out a title n proved it.. Would those 291 double humps be angle plug Allen? Cool projects and awesome cars..
It's a nice serie starting here! I'd like know more about the cylider heads used in 302 z/28s. Which serial # of heads were used in 302, were there over the counter replacements heads available also?
The 1969 was made for a year and a half. In 1968 there were some factory sold racing parts which included cowl induction through the firewall. There was a first design racing camshaft, which called for different valve springs, but those racing valve springs were made of defective steel. There was the 2-4 barrel cross ram intake and there was an "improved torque" camshaft, which later became the camshaft for the 350 LT-1 engine. The big difference from the 327 was the Z-28 intake manifold and large carb. The windage tray was a different design from the Corvette 327 windage tray, as was the oil pan. The 1967 Z-28 had single rear leaf springs with a traction bar. The 1968 Z-28 got multi-leaf springs in the rear.
I didn't realize the early 302 engines still had press in rocker studs. The 69, it must have had screw in studs and guideplates. Seems to me the rocker arms were "O" in terms of symbols. I doubt you'll see peak power much over 6500 with untouched heads. I would find it hard to put original TRW pistons and original pink rods in a block that rare. I would try and convince the customer to use a set of aftermarket I beam rods and a lighter forged piston. UEM Icon IC802 looks to be a suitable replacement number provided you're willing to substitute.
My Dad had a 68 Z/28 that he bought brand new. He put in the GM off-road cam and headers. 4.88 gears. Drag raced it all summer and ultimately dropped a valve and cracked the block. He sold it blown up. He told us many stories about it when we were kids, so I have always had a soft spot for 68 Z’s.
Why do you say ZED/28 ? It’s known as a Z/28 down here in the US. Must be a Canadian thing. Drag racers were building 301’s well before Chevy built Z/28 302’s Just bore a 283 out .125” Lots of 283 blocks were thick enough.
We Canuks pronounce the letter Z as zed. You Yanks pronounce it as zee. Not sure how the limey's that invented the language pronounce it. Probably got a limey slant on it.
Ianbuilds7712, no arguement from me on that, however in the 1960's before the General introduced the Z/28 302 guys would bore out a 283 block 0.125" to 4" and used 327 pistons. At the time they called the engine 301Ci. Older guys still swear by the 301 designation.
Hard to believe that Chevy cast a block with enough thickness to over bore .125. A 1970’s and later block can get iffy at just .060. Shows just how stout they used to cast the early engines before they became worried about saving weight in every place. They should have kept on casting the blocks thick. A few extra pounds wouldn’t have made a difference in because they made the rest of the car heavy anyways. The extra material cast into the engine block could have saved a lot of engines from blowing up.
If you're still looking for some parts they are some of my prized things but I do have original 302 pistons Got them from a friend that put 12-1Got them from a friend that put 12 to ones in his motor and on the test drive the transmission broken half and ripped the shifter right out of his hands
Thanks Ronnie. Right now we are looking for windage tray bolts. We have some but they are too long in the body. Let me know if you have anything. We need 3" bolts. IF anyone is looking, please let me know if you have something. AG
Oh no not that diagram... It's only good for pre 74. Weekly, someone online is showing a pic of a cast 442 350 crank flange looking to confirm it's a 400 crank because of that diagram. GM made about a 100 million SBC after 1974. That diagram is not accurate for the majority of SBC cranks GM produced. Casting numbers should be used. In no way saying you have the wrong crank. I'm sure being knowledgeable you do. But for the people watching and just learning its not a good resource.
What is funny that back in the 60's we all wanted to build a 301 which is the 283 bored out to a 4 inch bore. I was working in an automotive machince shop at that time. The 30-30 cam was available at the time and everyone used TRW forged pistons which is what is in the factor 302. Basically people were building what Chevy finally pieced together but advancements in all aspects of engine parts improved by the time of the Z/28, referring to valve spring and pushrod guide plates, intake manifold, carburetor, windage tray. The Melling high volume oil pump was available also. Thanks for posting this.
and thanks for your comment 4speed. AG
I had one in 1974 . In the trunk was the cross ram intake , air cleaner , and one carb. That setup today is half what the car is worth.
pretty rare for sure. Thanks John. AG
CE stands for Chevrolet Engine , not counter exchange. Need correct oil pan. Dynoed my stock DZ build a few weeks ago . 367 HP @ 6000 Rpm.
Actually CE stands for crate engine
Thanks Donald, 367 is a good number. AG
367 at the crank, you mean.
@@Geezer1320 wrong.
@@shelbyavant5081 Anytime somebody quotes dyno numbers...it is assumed to be crank HP...If it is not, we say "at the wheel" or state WHP.
Very cool! '68 happens to be my favorite 1st Gen
Mine too! AG
Alan,this channel keeps getting better and better 👍
I never knew there were different crank shaft ends 😮
Thanks
Thanks for the nice compliment David, we will keep digging. AG
I am really excited about this build series. I have always been a fan of the 302. I get irritated when people think that the DZ302 was the only one built. I can't believe you guys were able to find 2 MO blocks much less with the correct dates. I have been collecting parts to build a 302 myself. I don't own a Z28 but I do own a '68 RS that will get a 302 eventually. I'm just using a 327 block, 283 crank and the heavy 283 truck rods. The first part I bought were the 11:1 TRW pistons.
Thanks Captian. We're excited too. AG
Really cool guys, looking forward to the builds and dyno testing
Thanks Gary, so are we. AG
Fantastic video. With all the activity and projects you have going you're going to need a bigger shop. Looking forward to seeing these engines on the dyno.
Thanks Todd, getting crowded for sure. i got the parts for Joes 400 today so i should have it on the stand this week, then to the dyno. I will have your block back next week. Watch for the cause and effect video. AG
Love the sound of the 302. Miss my old 69 with the ‘140 cam in it.
Beautiful cars
Thanks John. AG
68 did not have screw in rocker arm studs GM started using them in 1970 great video thanks
You are correct Morgan. Thanks for watching and commenting.AG
Exciting to see these builds. Keep up the great work AG. The dyno episode will be fun.
thanks again for your comment Kloeppky. AG
Alan, now this is something that really gets my blood boiling. Small V8's that rev. Real Cool. This is going to blow up your channel. all the best.
Thanks for your comment Stuart. We will do a complete blueprinted build on each of these engines. We will rev them past 7000 like it’s 1968. Stay tuned for more videos.
AG
Pieces of art. Love it! Man I would Love for you to build me a nice 350 for obs Chevy Truck 🙏🏾😊
Thanks John. AG
I had some #186 69 Z-28 heads on my 302, made angle heads out of them and put screw in studs on tge heads. 2.02" intake and 1.60" exhaust valve. 64cc combustion chamber cut down to 60cc... Ran the Z-28 brown valve springs, with GM hi-performance push rods.
Thanks Leonard. AG
Hi Alan, Still working on my 296. >080 over 283 with a steel crank, H beam rods, E Street heads, 79 cam. I am having a bit of a problem getting the passenger bank to oil. Plenty of oil flow in lifter bore 8 so not sure what is up. The block is a thick casting '64 for my '64 El Camino. I won't turn it like the 302 but should be pretty powerful. I am planning on another 296, this time with a "61 block and steel crank. Probably going to go with a. set of power pack heads with larger valves to look stock. Still planning and gathering parts. Still enjoying the videos.
Thanks for sharing. AG
Hello Allen, I finally figured out the oiling problem. The motor was partially disassembled when I bought it. I finally pulled the oil galley plug and installed the distributor and could see the sealing flange on the distributor wasn't going down far enough. I pulled the oil pan, pump and intermediate rod. I called Melling to see if I had the correct intermediate shaft. The shaft I had was for a big block. I purchased a new shaft and I think all will work. I have the clean up work done and new gasket set came yesterday so we will see. I will let you know.@@goldsgarage8236
Thanks Pat. I have heard of that happening before. Good catch on your part. I look forward to your follow up. AG
Zed -28?
4 inch bore of a 350 or 327 what's the stroke of a 283 thus you come out with the 302 large journal, Basically a high RPM road race motor for my native American friend would say engine.
Thanks for the comment Paul. AG
Put a 283 steel crank in a small journal 327 and 💥 a 302
That is correct. AG
Exciting stuff!
Thanks son!
Nice.. I got a friend with a 66 titled camaro. I always assumed it was a 67 until he pulled out a title n proved it..
Would those 291 double humps be angle plug Allen? Cool projects and awesome cars..
Angle plugs came out in the 70's, 492's being the first. Then 292's in '76.
Thanks for the question Phil. No they are straight plug heads. AG
Can you build a 302 from scratch?
Sure, all the parts are available. AG
It's a nice serie starting here! I'd like know more about the cylider heads used in 302 z/28s. Which serial # of heads were used in 302, were there over the counter replacements heads available also?
They were the same as the fuel injected Corvettes. AG
The 1969 was made for a year and a half. In 1968 there were some factory sold racing parts which included cowl induction through the firewall. There was a first design racing camshaft, which called for different valve springs, but those racing valve springs were made of defective steel. There was the 2-4 barrel cross ram intake and there was an "improved torque" camshaft, which later became the camshaft for the 350 LT-1 engine. The big difference from the 327 was the Z-28 intake manifold and large carb. The windage tray was a different design from the Corvette 327 windage tray, as was the oil pan. The 1967 Z-28 had single rear leaf springs with a traction bar. The 1968 Z-28 got multi-leaf springs in the rear.
I have a traction bar 12 bolt lots of people have tried to buy it but it’s under my 68 with mono leafs that I’m restoring.
Thanks for the info Brandon. AG
Are they going to keep them stock? If not I have some ideas keeping them stock looking but more HP. Thanks for the video.
Thanks Don, still in the planning stage. Let's have your suggestions.AG
What size wheels and tire combo are you using there
Looks great
Thanks Travis. All 68 Z-28's came with a 15" tire and 6" rim. AG
I didn't realize the early 302 engines still had press in rocker studs. The 69, it must have had screw in studs and guideplates. Seems to me the rocker arms were "O" in terms of symbols. I doubt you'll see peak power much over 6500 with untouched heads. I would find it hard to put original TRW pistons and original pink rods in a block that rare. I would try and convince the customer to use a set of aftermarket I beam rods and a lighter forged piston. UEM Icon IC802 looks to be a suitable replacement number provided you're willing to substitute.
You are correct about the "O" rocker arms but the 69 had pressed in studs. I converted a few of them myself. AG
Did the engines change in one of those yrs from small journal to large journal? Or were all 302s small journal?
Yes Jesse, the 1967 302 had a small journal crank, 2.00" rods and 2.3" mains, same as a 283. In 1968 they changed to 2.2" rods and 2.45" mains. AG
6426yy, 4" piston off the shelf. Which engine I do not remember now.
I have a set of 11-1 std bore pistons for a 302. It was for a future engine . Hard to find a good 327 std bore.
Very rare for sure, thanks Arnold. AG
I’ll send you some pictures of the pistons , with the part number stamped on top.
Can I email you ?
@@goldsgarage8236 The part number on the pistons I have is 3917625
My Dad had a 68 Z/28 that he bought brand new. He put in the GM off-road cam and headers. 4.88 gears. Drag raced it all summer and ultimately dropped a valve and cracked the block. He sold it blown up. He told us many stories about it when we were kids, so I have always had a soft spot for 68 Z’s.
Thanks Tom, pretty similar to my experience. AG
Don't count on that sbc crank flange ID chart.
Some of the later 283s had that notch in the flange .
Why do you say ZED/28 ? It’s known as a Z/28 down here in the US. Must be a Canadian thing. Drag racers were building 301’s well before Chevy built Z/28 302’s Just bore a 283 out .125” Lots of 283 blocks were thick enough.
We Canuks pronounce the letter Z as zed. You Yanks pronounce it as zee. Not sure how the limey's that invented the language pronounce it. Probably got a limey slant on it.
Bore and stroke the same and what you get for displacement is a matter of how you round the result.
What are you saying?? Bore x pi x stroke x number of cylinders= displacement... 4"bore × pi x 3"stroke x 8cylindes= 301.59 cubic inches...
There is only one way to round that result and that is 302... So again what are u on about?
Ianbuilds7712, no arguement from me on that, however in the 1960's before the General introduced the Z/28 302 guys would bore out a 283 block 0.125" to 4" and used 327 pistons. At the time they called the engine 301Ci. Older guys still swear by the 301 designation.
Be funny if u snuck a 327 rotating assembly in one of them😏
Thanks Mind, people do that a lot, 383 also. AG
If the engine has a CE on it ,... its a chevrolet replacement engine for one that has been blown up or met some other fate !
i think that is correct, thanks for the comment. AG
didnt realize the MO blocks were 2 bolt mains😞
That's correct. Thanks Kim. AG
If you have shopping needs, people might see stuff at swap meets in the states..
Thanks for the suggestion 91, Tony and Robert are always searching. AG
Hard to believe that Chevy cast a block with enough thickness to over bore .125. A 1970’s and later block can get iffy at just .060. Shows just how stout they used to cast the early engines before they became worried about saving weight in every place. They should have kept on casting the blocks thick. A few extra pounds wouldn’t have made a difference in because they made the rest of the car heavy anyways. The extra material cast into the engine block could have saved a lot of engines from blowing up.
Thanks for the comment Robert, in 1968, all 4' bore Chevrolet blocks including the 302 were the same casting, #3914678. AG
If you're still looking for some parts they are some of my prized things but I do have original 302 pistons Got them from a friend that put 12-1Got them from a friend that put 12 to ones in his motor and on the test drive the transmission broken half and ripped the shifter right out of his hands
Thanks Ronnie. Right now we are looking for windage tray bolts. We have some but they are too long in the body. Let me know if you have anything. We need 3" bolts. IF anyone is looking, please let me know if you have something. AG
Actually, we pronounce it " ZEEE" ( 3 e's)
Just kidding, enjoying the content.
thanks Anthony! , either way its the same car. AG
I am so disappointed in seeing a F150 in the driveway😢
There was no 66 Camaro's... Made a mistake on the title!
i call them z28 what is that z word your calling them?
Oh no not that diagram... It's only good for pre 74. Weekly, someone online is showing a pic of a cast 442 350 crank flange looking to confirm it's a 400 crank because of that diagram. GM made about a 100 million SBC after 1974. That diagram is not accurate for the majority of SBC cranks GM produced. Casting numbers should be used. In no way saying you have the wrong crank. I'm sure being knowledgeable you do. But for the people watching and just learning its not a good resource.
Thanks for your comments. AG
That pronouncing of Z as zed is annoying as hell.😂 But that is from a British education back ground.
ITS A Z...28 why do you mispronounce it ??
Because they’re Canucks.
But it’s how the Brits and Ozzies say it the same way. It’s USA speakers who are out of step.
@@oldschoolmotorsickle z in english and zed in french so zed vingt-huit! (z28)
@@chrisland169The English have always pronounced the letter Z as Zed. Someone in the U.S.A. decided to change to Zee