What's you talkin bout willis

9.3:1 with the right tune and setup at 6psi and 93 octane will give you a good margin of error. Mine were as high as 9.6:1 last year with 6.2psi but I did end up breaking a crank. But that was a engine builder issue not setup or detonation I'm pretty sure. My engine builder can be a real putz at times.

I am afraid to go more than 8.5:1 at 5-6 psi...... It will give an effective comp ratio of around 13.0:1 it is little higher with 92 fuel.

Are you in high altitude???

No, close to seas level on the chesepeake. I don't think your dynamic compression estimate is right but don't have my chart with me at work. From memory my setup at 6psi and 9.5 was 13.4:1. With my 4.8psi pulleys it was mid 12:1s I have engines tore down now and there is no signs on the piston tops of detonation on the 9.6:1 engine. There is a broken crank though but that is a different story.

Hey Dave, I didnt know you broke a crank. Rough.

I am sure that you will have it back together for next season ready for another shot at the old single engine Kryptonite

Dave's (Blue Thunder) boat hauls some serious ass.

I actually just got done putting the smackdown on a green activator and it broke. Pretty ugly. New block and all needed. I start assembling next week on the new block so it will definately be go time come spring. I wanted to get a couple imco shorties over the winter but that may have to wait. That was going to be my secret weapon for you come spring..

Did someone know the stock 525sc rod length??

I will probably do a piston ring refresh so i think i need this info to get the right stuff....

should be a 6.135 rod.