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[Z06] How my horsepower am I giving up with a .635 lift cam.

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[Z06] How my horsepower am I giving up with a .635 lift cam.

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Old 04-16-2018, 05:16 AM
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lamboworld
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Default How my horsepower am I giving up with a .635 lift cam.

I am using a TSP custom cam and the I/E lift is .635". However, they do offer lobes that have lift of .655/.657 and I am wondering how much whp , if any, that I am giving up with the slightly lower lift on my current cam.

I am using AI ported heads. Here is some information that I found on their flow numbers.
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Old 04-16-2018, 07:34 AM
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Schred86
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I would guess 10-20 peak. But you might lose a little in the beginning of the power curve.
What is your power goal and main use for the car?
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Old 04-16-2018, 08:36 AM
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BigVette427
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I believe your duration and LSA will have more of a determining factor. Lots of LS7's out there with lifts < .650" who make plenty of power. If you're gains are so high in the RPM band that you rarely ever see anyways, you're not actually "realizing" those gains.
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Old 04-16-2018, 09:09 AM
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lamboworld
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Originally Posted by BigVette427 View Post
I believe your duration and LSA will have more of a determining factor. Lots of LS7's out there with lifts < .650" who make plenty of power. If you're gains are so high in the RPM band that you rarely ever see anyways, you're not actually "realizing" those gains.
My cam is pretty mild: 236/250 LSA 115+4

I am sure that I give up some peak whp with the +4 advance but I am not that familiar with how lift factor in whp numbers.

If I had this same same cam with a .655 lift, would I see any difference in mid range or peak whp and if so, approximately how much.
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Old 04-16-2018, 09:41 AM
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PuckDracon
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.02" more lift with the same duration and lobes would not be a big difference. That is not even as much lift difference as going from a 1.7 to 1.8 rocker on an early LS (LS7 is already 1.8).

I'd guess 5hp tops, if that? Definitely under 10hp.
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Old 04-16-2018, 04:57 PM
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Josh B.
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If I were using stock rockers I would just stay at .635" lift, engine longer valvetrain life, give up a couple hp
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