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Theres a ton of great guys that have their own cams out there. But How many of them have the SBE 5.3 dyno sheet to prove their cams better than another?
As seen by the cam dyno and about a dozen holdner videos, its really splitting hairs with most of these shelf grinds. They all have a very similar curve with maybe a 10-15hp swing at the higher or lower RPM range. With a feather weight… id shoot for whatever has been proven to make the highest numbers from 5500 to 7500ish and let it eat. The other end of the spectrum is buy the cheapest cam (in many cases for me, that was summit). Then spend the money saved elsewhere (head work). Would probably make more of a difference than sweating over 5-10 HP swings goiugn for the “perfect cam”.
Theres a ton of great guys that have their own cams out there. But How many of them have the SBE 5.3 dyno sheet to prove their cams better than another?
As seen by the cam dyno and about a dozen holdner videos, its really splitting hairs with most of these shelf grinds. They all have a very similar curve with maybe a 10-15hp swing at the higher or lower RPM range. With a feather weight… id shoot for whatever has been proven to make the highest numbers from 5500 to 7500ish and let it eat. The other end of the spectrum is buy the cheapest cam (in many cases for me, that was summit). Then spend the money saved elsewhere (head work). Would probably make more of a difference than sweating over 5-10 HP swings goiugn for the “perfect cam”.
Not sure there is a perfect cam.
Using sim software, there is only a few HP swing in both directions that correlates with your comment. Still havent finished up the holdener video rabbit hole data mining, however still thinking the TSP MS3 or the XR-281-HR. plenty available new and used from people chasing that last 10hp.
agree with the feather weight, not sure one cam will matter over the other that much as I will have under 5#/HP weight/power ratio with most of the cams looked at in this thread and I get into plenty of trouble with 10#/HP of the daily whip
and the graph stops at 6700 RPM where the others fall off.
so basically, based on speculation, the summit 8711 should have a bit more than the Comp 281LRR-H13 (54-469-11) which should be a tad more than the 277LRR-H13 (54-454-11) . The dyno video rabbit hole shows slight advantage to the comp 277LRR over the "stage 4" cam of 8711.
That cam is very close to mine dur/lift (unsure lobe ramp profiles) also I'm on a 110 LSA 106 ICL. My cam will not fit without fly-cutting using stock pistons.
That cam is very close to mine dur/lift (unsure lobe ramp profiles) also I'm on a 110 LSA 106 ICL. My cam will not fit without fly-cutting using stock pistons.
Originally Posted by Scott Danforth
I believe Comp grinds the BTR cams. dont know who grinds for summit, could be...
Hey folks,
Our Pro LS cams are a private label part. We cannot disclose the manufacturer per our private label agreement. We can tell you that Pro LS Cams are 100% made in the USA
For more info on the manufacturing process check out this article. It's detailed from start to finish with pictures of the entire process.
The LS cam lineup that Summit has rolled out over the last couple years is seriously impressive. If you aren't a building a car the needs to go break all the records and beat all of the people, i would highly consider going with what they recommend based on what your usage will be. You just have to be honest with yourself about the usage!!
Martin Smallwood also spec's for Cam Motion these days. He's very good as well.
now since the LS4 is on a cart in the garage...... time to look at bump-sticks more in-depth
looking at used bumpsticks on facetube marketplace. a few new in box ones locally, however older BTR and TSP grinds and they want almost the same as a new cam. some claimed to be run only a few miles, however they want much more than half a new cam.. a new in box Summit 8712 showed up for $50, thought of running that with 1.8 roller rockers to get the 0.50" lift to at least 0.53" while the price is cheap, the cam is only 210/218. I would get the motor running DOD delete quickly, however leaves so much on the table....so passing on that
the pricing of the kits from BTR and Summit have me leaning that way. BTR HotRod cam kit is about same price as the summit offerings.... Summit 8707 was recommended, however also looking at 8702, 8703, 8704 and 8711.
leaning toward the 8703 because of the tighter LSA. would need to find my fly-cutter tool, or back to the 8704 simply because the car weighs so little.
Googles AI say Summit 8702 for the 3.08 rear. looking at other final drives, gets the same results. long duration with tight LSA.Similar to @Forcefed86 recommended in post #29
now since the LS4 is on a cart in the garage...... time to look at bump-sticks more in-depth
looking at used bumpsticks on facetube marketplace. a few new in box ones locally, however older BTR and TSP grinds and they want almost the same as a new cam. some claimed to be run only a few miles, however they want much more than half a new cam.. a new in box Summit 8712 showed up for $50, thought of running that with 1.8 roller rockers to get the 0.50" lift to at least 0.53" while the price is cheap, the cam is only 210/218. I would get the motor running DOD delete quickly, however leaves so much on the table....so passing on that
the pricing of the kits from BTR and Summit have me leaning that way. BTR HotRod cam kit is about same price as the summit offerings.... Summit 8707 was recommended, however also looking at 8702, 8703, 8704 and 8711.
leaning toward the 8703 because of the tighter LSA. would need to find my fly-cutter tool, or back to the 8704 simply because the car weighs so little.
If you end up deciding on the 8707, I have one that was slid in the cam bearings and never run. I'd make you a deal on it.
going with the 8702 cam. chatted with a member that had the 8702 and 243 heads on flat tops with a carb and loved it.
so to close this out, I put labels on the curves.
with the 2000# vehicle weight, actually any of the cams would work, however I like tight LSA's and do not need any power down low as stock, the car had only 16hp
Make it a good practice to not pay attention to AI responses or advice…words to live by.
X2! I have found a larger number of AI recommendations and more "facts" being incorrect than I'm comfortable with. I wouldn't trust most of the stuff they say about many topics. AI....Without the I........
Last edited by grinder11; Oct 20, 2025 at 01:33 PM.
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