Thank you Oldskool. That is exactly what I was missing.


Cme469, I appreciate you sharing your personal experiences on this.

So it appears that the options, now that we would be at 10:1 or less, would be to run the 670 heads but choose the pistons and cam very wisely. I am very interested in the flat top option simply because of the lesser cost for the forged L2262F pistons but I do want the motor to be very driveable on the street. I also would make that cost back quickly if I could avoid octane booster by running one of the dished Icon pistons below on pump fuel. I would also want to have plenty of vacuum for the power brakes. I also noticed that the Icon pistons come in a wide variety of dish volume. However, the compression distance seems to be very different on some. They offer the IC938 with 10cc @ 1.300, the IC891 with 14cc @ 1.720, and the IC889 that was suggested earlier with 15cc @ 1.490, which are very different than the L2262F @ 1.714. I do see that the IC9946 is also a 10.80cc dish @ 1.714 like the L2262F if that would be a suggested option.

Also, what would you guys suggest as an "ideal" cam choice with the L2262F @ 6.7cc with mixed fuel or the 14/15cc dished Icon pistons on premium pump fuel?

I cannot thank you guys enough for helping me out with all of the info.