How much compression;

Just got a 327 bored 60,with flat top pistons with 4 releifvalves and 461 double hump heads ,was wondering how much compression it'll have. Hope this is the right place to post this,thanks Phil

 

Way to many variables to say for certain. 327 compression distance should be 1.671, considering the heads should be in the 62cc area, .025 deck clearence and a .018 gasket would put you in the 9.5:1 area.

 

try...
http://www.dmperf.com/compression.htm

 

I just finished putting a very similar 327 together. Be careful if you are using cast pistons as the piston compression height so often times 0.02" less than stock. I wound up taking my block back to the machinist and shaving the decks further so that I'm 0.02" in the hole. I puts 0.015" steel shim gaskets on and wound up with a very tight 0.035" quench (maybe too tight, fingers crossed) and about 9.8:1 compression. I figure the quench will help mitigate the risk of detonation with the iron heads and compression ratio. Still haven't fired her up so can't provide results for you yet. I hope this helps..


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Thanks alot for the info, hopefully I can run pumpgas.

 

you'll get by on pump gas...timing is everything