[njsteve]

We cc'd the 1975 6X-4 cylinder heads today. One head had chambers all at 94.5cc and the other head were all 93cc. A Pontiac engine guru plugged all the technical info from the build into his desktop dyno and it comes out to 9.44 to 1 compression and a predicted 390 horspeower at 4500 rpm and 480 lb-ft of torque at 3400 rpm. Compare that to the SD455 net rating with 290 horsepower at 4000 RPM and 390 lb-ft at 3600 RPM. [img]<<GRAEMLIN_URL>>/naughty.gif[/img]