79 vette. standard block,pistons.if i change heads to 64cc.

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1979 Corvette

Other factors involved,,cam,rockers ect,but just as a rule of thumb, Id say about 9.0 to 1,,just a educated guess,,If I were going to do that though, Id step up the cam from stock, also you have to make sure stock intake will mate up to new heads,,good luck, rd

Assuming you have 8.5:1 ratio now, you might get around 9:1. The head gasket thickness will play a part, also, as will valve size.

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Joel Adams
C3VR Lifetime Member #56    
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

thanks thats what i wanted to know.

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1979 Corvette

Who...ME?
I'm doing pretty well, I suppose. Good to see you back on the forum, Jack & Marcia!!


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

getting dire over here,if you have a job,you'd better stick with it,as not alot going.

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1979 Corvette

Same here...any job is a good job these days...
Sounds like you are getting the Vette ready to go! Good Luck with it, and keep us up to date on how it's coming along.


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

I have an L-48, 350 engine and I just put in a Comp Cam hydraulic roller cam, (210/220 and 112-degrees); a set of aluminum Edelbrock E-Street heads (2.02/1.60; 64-cc); a Holley Street Avenger 770-cfm carb; Patriot tight-tuck headers; 2 1/2-inch aluminum dual exhaust and Magnaflow mufflers.  My CR now measures 9.7:1.  The stock engine was rated at 8.5:1.

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Chuck

79 L48 engines had 8.2:1 ratio with 73 cc heads.  The only thing that affects compression ratio in this example is the volume of the chamber with the valves closed. With dished pistons, your new ratio will be about 9.2:1.  That is enough to support a little more cam, but I wouldn't go wild with long duration:  maybe a 262 advertised degree cam with upper 400 lift.

Larry