American Heritage

Exactly how much more power does a higher lift camshaft make vs an identical lower lift version of the same camshaft???
With the Help of Cam Motion Camshafts and Hotrod Magazine we testing this on our In house Superflow SF902s Engine Dyno.

Hotrod Magazine published the testing in both their Online Magazine and their upcoming in Print Magazine

To read the full Article and to get all the details on the testing go to www.hotrod.com
or click on this link: https://www.motortrend.com/how-to/hi...dyno-test-ahp/

Here are some Screen Shots from the Article














We would love to know what you/the Corvette Forum Community thinks about the testing so please feel free to post up your replies

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hp@americanheritageperformance.com
https://americanheritageperformance.com/

double06

Good article - always wondered about the lift assuming other things equal.

Apocolipse

This makes perfect sense as long as you have the airflow to make use of it great article thanks for the time you spent on it

American Heritage

Thanks Guys.
Yep good quick simple test that answered a question I think alot of people wonder about.


https://americanheritageperformance.com/

grinder11

If the LS7 was a V-16, it might be worth the 2.5hp/cylinder. But it isn't, so it's not, unless you're interested in going for an NHRA National record, which would mean 99% of the street car owners have left the building. All the extra wear and tear for street use is a waste, as it really doesn't show until around 5k rpm. It was a good, useful comparison, though. My .02? I feel that you could keep the lower lift (How many can remember when .625" lift was all out racing cam territory?!!), tighten the lobe separation angle to 114°-115°, add 2°-4° duration and outperform the higher lift cam on the track, if not the dyno's peak numbers. I know thats not what the comparison was about. For the Halibut-My stock bore and stroke LS7, with stock LS7 heads, stock intake, and 90mm OEM TB, made 617hp@6,300rpm, and 565ft/lbs@5,000rpm, on a Dyno Jet. Cam was a Comp, .638" lift I, .646" E, 238°/242° duration, on a 114 LSA, 12° overlap. Bringing the numbers soup to the table for comparison only. YES-I was surprised at the #s considering the small 4° split in duration. It was originally ground for use with 1.7 rockers, and AFR 225 heads......

REDZED2

Really not worth risking over .650" on FBO LS7. UNLESS BUILDING BIG DOLLAR FROM SCRATCH.

Apocolipse

Why is everyone focused on lift and this magical made up number that should be kept under otherwise failure will happen? If the geometry is proper and the springs are set it makes no difference.

jayyyw

big number scary

Apocolipse

JMB

Great test, thanks for sharing! There's a reason I run 0.781" lift in my LS7....;>D

American Heritage

Thank you!
I agree there is a time and place for a big lift camshaft and a time and place for a low lift camshaft

https://americanheritageperformance.com/

c6Zobsessed

The best results I've seen with an LS7 are with aftermarket heads fitted with a good valvetrain, conservative cam, and bumped compression. High lift on these engines is a waste when they like the smaller to medium sized cams better. Having usable power and torque all the way through the curve will hurt the dyno queen's feelings every time. That setup with some 3.91 gears to help tame the airplane geared trans = A tire shredding, feeling hurting, jaw dropping monster.

Mirek

This is my engine. It had a .720 lift cam in it.

It does not have that cam any longer.

https://www.corvetteforum.com/forums...-and-data.html