13.3's to 11.8's to Forget it...

My thoughts exactly, just gaskets to try. IF I only gain 2 tenths, then I'll learn a lot and be disappointed. slightly bigger valves, much better bowl area and smaller valve stems, I should gain compression, I just don't see 2 tenths.

You may be right, you will gain some lift too.

Only 1/8th mile tracks around me, 3 within 30-40 minute drive, so I'm just guessing for the 1/4.