![]() Well lumpy cams just don't always run that great in the real world. If you have over 10:1 or even 10.7:1 something like the XE268, Summit K1105 or crane 278 would be the best choices.Ĭomp cams is out there to make money and people like the sound of a car with a lumpy cam. So to keep cranking pressures up in a less than 10:1 motor you need cams with very little over lap. The problem was it was a low compression motor to start with. Not any get up and go off the bottom and poor 1/4 mile times even though it had a long list of hot parts and headers. One of the tested motors with an XE268 had only 140 or so cranking psi. They state that 185 cranking psi is about the tops for 91 octane pump gas. Which is easily measured by cranking pressure. I went back and reread some articles about dynamic compression ratios. Quote: I run the 268XE from Comp Cams, but if you want a little more off-idle power, go with the 262.Īfter running all kinds of simulations.
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