Some help with compression figuring

[90_Red_LX]

I believe I have the wrong pistons. I wanted 10.5-11:1 comp but I got probe flat tops, which is well below what I wanted from what I am figuring.

Motor is a 306. Here is the link to the probe site with info about the piston. It's the top set. 4.030 bore. Gasket is .045 from what I got from the ROL catalog compressed.

http://www.probeindustries.com/Pistons/Pistons_SRS/Ford/Ford_302.htm

What do you guys think?

 

[5spd GT]

So your looking at the 10682-030 pistons? That is the kind I have...

You can definetly get a piston that allows more compression and actually give you some power...

You could also try the ROL Headgasket - HG32841HR which is a .039 compressed thickness. Those are the gaskets I run from Ed as well...

He told me that he saves the .045 for supercharged applications...

You could try the 10466-030 piston...about 11.3:1 with 58cc heads...but with some head chamber work (money though), you could run the high 10's...

None-the-less, a bump for ya bud

Edit: With running the higher compression like that, you may want to think about getting a new cam from Ed designed for the increased static compression.