440 with 76cc head what compression ratio?
Thread Starter
Melting Slicks
Joined: Nov 2006
Posts: 2,463
Likes: 2
From: Santa Barbara, CA
440 with 76cc head what compression ratio?
I'm going LS7 440 stroker and I'm wondering what compression ratio I'll be with 76cc head and 440 with 4.1" stroke and 4.125 bore. Flat top Piston.
Burning Brakes
Joined: Jun 2007
Posts: 804
Likes: 0
From: Stockton California
There are more number needed to calculate your compression ratio, head gasket thickness and deck high of piston. I used .038 for gasket thickness and .030 for piston deck height volume. It calculates to 11.7, a little high for pumped gas.
Thread Starter
Melting Slicks
Joined: Nov 2006
Posts: 2,463
Likes: 2
From: Santa Barbara, CA
Not sure how to calculate piston deck or what that means. It's a flat top piston with valve reliefs. Hmmmmmm....
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I come up with only 10.36 With .038 gasket -7 cc for valve relief and pistons -.025 down in the holes.
You need 64 cc heads to get good compression
http://www.csgnetwork.com/compcalc.html
This site even gave less at 10.27
http://www.rbracing-rsr.com/compstaticcalc.html
You need 64 cc heads to get good compression
http://www.csgnetwork.com/compcalc.html
This site even gave less at 10.27
http://www.rbracing-rsr.com/compstaticcalc.html
Last edited by gkull; Feb 9, 2008 at 10:37 AM.
Racer
Joined: Jun 2006
Posts: 383
Likes: 1
From: harlan KY
I still have those GTP ported 317 heads for sell. I actually sold them to another forum member but they were for a 4.1 inch bore instead of a 4.0 as i originally thought, and he couldnt use them, so he is sending them back.
64.5 cc combustion chamber. 313 flow, double comp springs,2.10 intake valve. I cant remember the rest of the specs but i have them at my appartment.
I will let you have them for 700$, and i will pay to ship them. I will also give you the same garantee that i gave the other guy, If you get them and then find out that you cant use them like he did, no problem just send them back. P.M. ME BACK IF YOU ARE INTERESTED.
64.5 cc combustion chamber. 313 flow, double comp springs,2.10 intake valve. I cant remember the rest of the specs but i have them at my appartment.
I will let you have them for 700$, and i will pay to ship them. I will also give you the same garantee that i gave the other guy, If you get them and then find out that you cant use them like he did, no problem just send them back. P.M. ME BACK IF YOU ARE INTERESTED.
