I know I don`t have any of the specs for this engine but if anyone can help
it would be great.A guy at work is building up a 400 small block and want`s
to put a set of 64 c.c. heads off a 327.I told him he better try to find out what the compression ratio will be before he bolts them on.I believe it was 10.5:1 on
a 327.The 400 is a standard bore with stock or stock replacement pistons.I
know you can`t give me an exact number but even +/- .5 would be good.Thanks

 

There are several compression ratio calculators on the internet that you can use. Even if you don't know all the specs, you can guesstimate a couple, like deck height, piston valve relief ccs, and get pretty close.

Use Google.

Jake

West Point ROCKS! Nation's TOP COLLEGE per Forbes Magazine!! Graduation Day Parade 20 May 2010!!!

 

64cc heads likely wont push the compression ratio too high on a performance build with a mild-moderate cam, etc. The killer will be quench. Stock deck with rebuilder pistons = bad quench. He needs to do some measuring.

Also, what is this engine going in? What year are the heads. In all honesty he is better off going with a better set of modern heads.