Dyno a 7.5:1 400? Sure, why not?

dukeboy_318 said
Ok, my concern is that I am wanting to go to ebby RPM heads at some point when I can, mainly for weight savings as well as power. Would that affect the CR enough to actually hurt the performance? I currently have regular Silvolite 1263 flat top pistons but was thinking of jumping up to 6-pack piston with valve cuts, L2335 is it?

Well the piston is L2355. If you went to the RPM cylinder head it will only make everything better. With that piston, zero deck height, .039 gasket and the 84cc head you'll only be at 10:1 compression. Check piston to valve clearance carefully as I had to flycut the L2355 pistons on 'Pop's 440' when we went to the roller cam.