Getting the most out of a low comp 440

Are you going to use different than the stock pistons? If not, you will have to mill a LOT. The stock compression will blueprint into the 7s. That's two points to make up. That a lotta milling. Probably on the order of .150". The cost of milling alone would probably be more than buying a nice set of Six Pack pistons.


Milling is FREE! I have a general machine shop, remember. I just don't have an engine cylinder boring machine - trying to make use of what I got to save $. Heck, I have a big enough vertical lathe, I could TURN the block and heads to trim 'em down, haha!

.060" Is max for heads per Mopar IIRC, maybe a few more off the block, wouldn't hurt to square it up if it isn't.

I think I can also go bigger valves and plunge cut for cost of tooling...unless IQ talks me out of it. :D

I have crunched rough comp/milling numbers, and will more carefully...ain't going in blind!