Compression help
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From: Missisauga ON
Compression help
I know it would be a ballpark guess but does anyone know what
the approximate c.r. would be of this setup.
-355 chev
-flat top pistons w/ 4 valve reliefs
-72 cc heads
I am guessing 9.0-9.5:1,and would this support a Comp Cam
XE-274(230@50,.487lift int. 236@50,.490lift exh)The rest of the
setup is a 700r4 a 3.73 gear,15/8 shorty headers,750 v.s.,w.p.
sportsman II intake.3600lb Camaro. Looking for high 12`s here.
the approximate c.r. would be of this setup.
-355 chev
-flat top pistons w/ 4 valve reliefs
-72 cc heads
I am guessing 9.0-9.5:1,and would this support a Comp Cam
XE-274(230@50,.487lift int. 236@50,.490lift exh)The rest of the
setup is a 700r4 a 3.73 gear,15/8 shorty headers,750 v.s.,w.p.
sportsman II intake.3600lb Camaro. Looking for high 12`s here.
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Joined: Sep 2003
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From: Fairview Heights Illinois
Car: 89 Irocz
Engine: 350TPI $6E
Transmission: 700R4
I just learned how to do this so I'm practicing.
When I figured it I got 8.97
I used .025" deck height and .038" gasket and 6cc valve reliefs.
When I figured it I got 8.97
I used .025" deck height and .038" gasket and 6cc valve reliefs.
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From: Boosted Land
Car: 92 Z28
Engine: Boosted LSX
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Joined: Sep 2003
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From: New Mexico
Car: 1991 Camaro Z28 5.7 G92
Engine: L98 Tuned Port Injection
Transmission: TH700R4
Axle/Gears: 3.23 Posi G80
Your about right because 355 flattops with 76 cc's are about 9 to 1 so I would say about 9.3 to one. THat's pushing it for that cam, you should have put more compression because that much duration has a good amount of overlap. I say say it'll work fine though.
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Sep 21, 2015 09:48 AM