I have a 383 LT1 engine in car i just bought withincreases trick flow heads on it. I need to know a way to find out my compression ratio WITHOUT taking to motor completely apart...I am going to a blower setup and i NEED to find out the CR since that is directly related to my boost i can run

thanks
Dustin

 

compession tests the traditional way wont do any good with aftermarket cam specs. the overlap on the hi-po cams really F's up compression tests. you have no idea what pistons you have in there or anything. if you can get the piston specs, the rest can be closely estimated.

 

Who did you buy the motor from/who built it? Can you talk to them?

Find this information:
https://www.camaroz28.com/calcs/cr.html

 

the guy i bought it from did not build the motor either...wqas built by the guy before him

 

I don't mean to hijack the thread, but I was wondering also if anyone could do the compression formula for me. 74cc heads, 10.1.1 compression with 20cc blower dished pistos, supercharger with roughly 10-12lbs of boost.

 

http://www.csgnetwork.com/compcalc.html PS: ya really need all of the info to get it exact