The static compression that can be used with a pump gas engine is dependant on the intake closing point determined by he camshaft. Engines with late closing intake valves generally need more static compression to function propperly, and engines with earlier closing intake valves will have a lower of tollerence for static compression. Choosing any camshaft for any pump gas engine should take into account this dynamic compression as well as the power range and type of the camshaft. There is a good explaination and a downloadable calculator for dynamic compression here: http://cochise.uia.net/pkelley2/DynamicCR.html. I would make sure the cam shaft selected for the pump gas engine keeps the dynanic compression between 7.5:1 and 8.0:1 for best engine function and performance. You can adjust your static compression to suit a particular camshaft if you find a cam profile you like that does not provide a good dynamic compression ratio with your planned static compression.
I ran a few TA cams through the calculator with your planned engine perameters. The best one I found was the "sleeper" 288-94H. It can be used with stock rockers and provides 7.7:1 dynamic compression with 10.25:1 static compression with 66 cc heads, 14 cc dished pistons, .035" gasket, and .025" piston to deck clearence (total .060" quench is the max you would want to use). The 288-98H also was good at that static compression range, but seems more radical than you want to go.
Bookmarks