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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2011 Posts: 134 'Bolter | | 'Bolter Joined: Dec 2011 Posts: 134 | I’m looking for a set of low compression heads for my daily driver. I’m looking for comp ration of right around 8.5 like the stock casting 3927185 heads. It doesn’t matter if aluminum or not. Tried calling all mfg’s but I guess their busy. Any help would be appreciated . Running flat tops and cam ids open. Ps gas is killing me | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | 9.5 CR is frequently mentioned as suitable for today’s regular fuel.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Feb 2016 Posts: 1,982 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,982 | Should be about a zillion of them available, with flat tops you would want something with a combustion chamber around 74 cc, I would think anything from 72 cc to 76 cc would be fine, stock cast iron Chevy heads are probably the most prolific item around. I built a 383 with flat tops and single valve reliefs, cc'd the heads and did the math and I'm at 9.5 : 1 with 74 cc heads. GM used those from the very early 70's through the early 80's. Call your local machine shop, mine keeps some on hand that they have deemed ok to build. I've got only one set of extra heads but shipping would probably be a killer.
Last edited by 78buckshot; 01/26/2022 1:17 PM. Reason: added info
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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