I am toying with the idea of building a very mild 383 for my 72.
Looking for help selecting a stroker kit.
Want to keep CR around 9.5.
Looking for help selecting a stroker kit.
Want to keep CR around 9.5.
Mild 383 Stroker Help
harperrunstables
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6 Posts
I am toying with the idea of building a very mild 383 for my 72.
Looking for help selecting a stroker kit.
Want to keep CR around 9.5.
Looking for help selecting a stroker kit.
Want to keep CR around 9.5.
Joined
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6 Posts
I have 882 heads now but would also like to hear about junkyard bolt on options. Don't want to go new if I don't have to.
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2,286 Posts
I have used these rotating assemblies and they are high quality... 383 STROKER ASSEMBLY SCAT CRANK 5.7 RODS WISECO -7.5cc Dh 030 PISTONS 2PC RMS | Skip White Performance - We have the best prices you will ever find for aluminum heads, rotating assemblies and strokers
You give up very little going with the 5.7 rod and seldom have any clearance issues.
You give up very little going with the 5.7 rod and seldom have any clearance issues.
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5,100 Posts
You'll be wanting to chuck them heads in the trash.
Stick with 76 cc heads.
Finding any in a junkyard in Canada, good luck with that. There are no vehicles in the scrap yards old enough to have what you need.
Set yourself an alert on Kijiji for SBC heads. I've scored some of my engine parts this way.
You'll need to tear down your motor to see what size overbore pistons you'll have to use.
Is your crank one or two piece rear main seal? Is it a 1972 motor?
Kit linked above looks good if you have a virgin block.
Stick with 76 cc heads.
Finding any in a junkyard in Canada, good luck with that. There are no vehicles in the scrap yards old enough to have what you need.
Set yourself an alert on Kijiji for SBC heads. I've scored some of my engine parts this way.
You'll need to tear down your motor to see what size overbore pistons you'll have to use.
Is your crank one or two piece rear main seal? Is it a 1972 motor?
Kit linked above looks good if you have a virgin block.
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2,286 Posts
Just FYI .030 over with 64cc heads and a 12cc dish is advertised as 9.7:1 compression. In reality, if you zero deck the block and use a .039 head gasket for proper quench, it’s actually closer to 10.3:1.
I highly recommend narrowing down what cylinder head you want and work backwards from there.
As for junkyard/used heads, it’s hard to beat vortec heads.
I highly recommend narrowing down what cylinder head you want and work backwards from there.
As for junkyard/used heads, it’s hard to beat vortec heads.
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6,051 Posts
Very mild and you can run the 882 heads.
If you are capable of building a 383 and clearancing the block then you are capable of bowl porting the heads.
No matter what cast iron sbc GM head you have it will respond to bowl porting.
My first 388" was a 350 with 400 crank turned down, 400 rods with 350 flat tops.
It did not get anymore budget than that and it lived through 2 owners and many 6700 rpm shifts with 214-224 @ .050 generic cam.
Heads were 624 castings i ported with the stock 1.94-1.50 valves.
I milled the heads .030" and chambers ended up at 72cc.
Compression was 9.56 .030 down the hole pistons and 5.5cc reliefs in the pistons 8.9 cc head gasket.
4040 race weight 64 Elcamino with 3.08 gear and TH350 with stock converter that stalled to 1150 rpm with the r 350 I used for the 388 build and now that same converter stalled to 2400 rpm!
Yea that blew my mind but this was built for my father-in-law.
Corked up it ran 15.2 et with stock exhaust manifolds and was out of breath at 5800 rpm.
Never ran it at the track with headers but it pulled hard to 6700 with ease.
Ran it against my 3300 lb 13.70 car getting on the highway and that heavy car with the headers would pull away.
Made me rethink my 350" in my 3300 lb car.
That is a reliable mild build anyone could pull off.
If you want 12's in the 1/4 you need more gear and or more cam than the above.
But you are no longer mild.
If you are capable of building a 383 and clearancing the block then you are capable of bowl porting the heads.
No matter what cast iron sbc GM head you have it will respond to bowl porting.
My first 388" was a 350 with 400 crank turned down, 400 rods with 350 flat tops.
It did not get anymore budget than that and it lived through 2 owners and many 6700 rpm shifts with 214-224 @ .050 generic cam.
Heads were 624 castings i ported with the stock 1.94-1.50 valves.
I milled the heads .030" and chambers ended up at 72cc.
Compression was 9.56 .030 down the hole pistons and 5.5cc reliefs in the pistons 8.9 cc head gasket.
4040 race weight 64 Elcamino with 3.08 gear and TH350 with stock converter that stalled to 1150 rpm with the r 350 I used for the 388 build and now that same converter stalled to 2400 rpm!
Yea that blew my mind but this was built for my father-in-law.
Corked up it ran 15.2 et with stock exhaust manifolds and was out of breath at 5800 rpm.
Never ran it at the track with headers but it pulled hard to 6700 with ease.
Ran it against my 3300 lb 13.70 car getting on the highway and that heavy car with the headers would pull away.
Made me rethink my 350" in my 3300 lb car.
That is a reliable mild build anyone could pull off.
If you want 12's in the 1/4 you need more gear and or more cam than the above.
But you are no longer mild.
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3,922 Posts
Your power is in the heads.....and check the build in my Signature.
Hard to beat a late 96-2000 vortec motor for the build. Comes with a hyd roller cam and is a one piece seal block. No more flattened cam lobes and no oil leakes form the rear seal again. Plus you will have a set of vortec heads and a block that might not need to be bored. You can order a eagle kit for a standard bore with dished pistons. Should be a little over 9.5 on the compression with the vortec heads. You can reuse most of the stock parts like the dog bones roller lifters spider oil pump pan front cover ( just plug the hole for the crank trigger) and the cam retainer. Very little grinding to clearance the block. I get my kits from Competition Products 1,800-233-0199 These kit a balanced and complete. Best of both worlds and for the cam a GM Hot Cam or the comp EX282 hyd. roller. Some of the builds in the mags with these stroker builds with vortec heads and these two cam are making around 450hp and tq. You can never have to much in a mild build, want more then get a set of GOOD aluminum heads and your closer to 5 and 5.
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6,021 Posts
I was wondering when you would chime in.
Rick
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6,021 Posts
You can sell the 882 heads. I just did. Certain rules for particular circle track classes make them want them.
Rick
Rick
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7,406 Posts
I'll 2nd that with some Vortec heads that run high 10's. Best bang fer yer buck.
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1,265 Posts
Scat rotating assembly...1,000 dollars or so. You can get like 5cc dish and 76 cc heads to make 9.5.
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