Moparts Tech Archive

Big Block

since you asked...the default 600hp combo

this motor has gone 10.15@133+ at 3200lbs.
typical mid summer ET's are in the high 10.30's@130-131.

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Molloy -- IMO, you can break it down into three factors (assuming the same engine displacement): compression ratio, head flow, & cam. With limited head flow you need to rely upon bigger cams, more RPM and higher compression to offset the big cam's loss of torque. If you can't run the high compression, you can't really get away with such a big cam. That leaves improving the head's flow capability to offset the lost potential HP & torque from lower compression & a smaller cam.

"fast..." and I think my new combination should make in the 590+/- HP range and can probably get away with pump gas & octane booster. However, I'm doing it w/ heads that flow 20+ CFM more than what he used here (305/240 @ .600"; worth roughly 40 HP), 11:1 compression, aluminum heads, and a shorter-duration cam (but approx. same net lift). It doesn't sound like the Edelbrock heads will be capable of the flow #s my Stage VIs have, although the intakes may be close, which would make my combination even tougher to pull off with that type of head.

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Thanks Mike,

Makes sense. A lot of the builders tell me I need to wind the hell out of it to get the power out of a comparably low CR motor. That requires extensive porting (like BradH said), a bulletproof valvetrain, and more frequent bottom end inspections for cap walk, bearing flaking, etc. Not exactly a low buck avenue, and is a steep price to pay for pump gas convenience.

Would a lower CR motor also suffer more from reversion (doesn't draw the charge in as well)?

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