![]() ![]() So in the same motor the 292 magnum would not have as choppy of an idle as the thumpr, and it would have a way lower DCR which would make for very soggy low end torque. IVC takes place at 48* ABCD a motor with a 9.5:1 static compression ratio this cam would have a 7.66:1 dynamic compression ratio 501/.501 lift with a 110* lobe lift this cam has 71* of overlap, so it would sound a little smaller than the thumpr. Lets compare that to a cam that would sound similar in the 292H magnum from comp. ![]() 479/.465 lift with a 107* lobe lift the overlap of this cam is 77* and IVC takes place at 35.5* ABDC on a motor with a static compression ration of 9.5:1 this cam would have a dynamic compression ratio of 8.35:1 The 279th7 thumpr specs out at 227/247* duration. What the thumpr does is give you the ability to have a nasty idle without grossly overcamming your motor. Thumpr cams make good power if you match them with good parts.
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