Need some help figureing out compression ratio.
04-16-2008, 07:57 PM
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Need some help figureing out compression ratio. I have a forged 347 short block with probe pistons. The pistons sit 11 thousandths outside the hole. They are a flat top piston with either a 2 or 4 cc valve relief. The heads I am thinking about using have 58cc chambers with 202/1.57 valves. The cam I will be using is a futral motorsports f13-112 with the 230"/232" .595"/.585" 112LSA. I am tryiing to figure out the compression ratio. I have not purchased the head gaskets yet so if I need to run a certain thickness gasket I can still order that gasket. If some one can figure out the compression ratio for me I would appreciate it. I guess figure it both with 2cc and 4 cc valve reliefs. I am not sure how much difference the valve reliefs will make. I just want to make sure I can run this combo on 93 octane fuel with out having to pull to much timing out.
04-17-2008, 08:38 AM
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I got like 11.8:1 compression with a .041 compressed head gasket with 2 cc valve reliefs. Is this correct? Is there a way to figure the cam info in also?