What CR are you guys with 408ci running for N/A engines and if your running in the 11s are you running 94 octane or less with out any problems of detination. And another question has anyone built a 425 ci. and has anyone gone .060 over

 

I gotta 370 and according to this site http://www.c5frc.com/calculators/Com...Calculator.htm im around 11.4:1 im running 91 with 110 mixed in with it

 

That cam sounds sweet whats it run.

 

Depends on how fast you can push it. But it's putting down some power, that's for sure.

 

You will want to calculate your dynamic compression.

 

well..it ran 3 days.. ended up breakin the auborn differential

 

im running 11:8:1 comp. on 91 octane

 

11:8:1? Holy **** that's like 1.375:1 compression! LOL

 

Isnt the dynamic compression calculation for running boost or nitrous.

 

Not solely, no. Dynamic compression takes into account other variables like your camshaft profile, air intake temperatures/pressures/altitude, volumetric efficiency and other things I can't recall off the top of my head. Google search "Dynamic Compression" or "Dynamic Compression Ratio" and you'll come up with a few good articles worth reading.