SD Performance
I sent an email to Dave to inquire about opening up the 72cc chambers to around 100cc’s. That would drop my compression to 9:18. If I wanted to put in a 4.5 stroke crank (Scat forged)and get 495ci the compression would bump right back to 9:65 ish. Assuming I had 325 cfm E-heads and the 4.50 stroke I suspect with the same hydraulic cam (237/244 on a 112 lobe separation with .533/.549 lift at 1.65) it might boost horsepower from ~500 to ~580. I have no idea how much more power the e-heads will make over the 6x-4’s with that cam(or a very similar hydraulic roller). Any thoughts on power and reliability of a 4.25 versus 4.5 stroke? This will be road raced and street driven with a 6-speed.
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