New Summit Pro LS Cams
#41
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Go and look at people that ran Comp Cam trunions. They start to fall apart right away. Mine looked terrible after 3k. Lucky I caught it
My EPS Comp cam was on the way out after 7K just like what was mentioned in this thread. Good thing I checked that too. I have sworn them off
https://ls1tech.com/forums/generatio...comp-cams.html
My EPS Comp cam was on the way out after 7K just like what was mentioned in this thread. Good thing I checked that too. I have sworn them off
https://ls1tech.com/forums/generatio...comp-cams.html
#42
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All of the BTR/LJMS cams are just comp cams. Comp used to do cams for TSP and they still do them for one other company.
That thread is from 5 years ago. Its likely that whatever issues they had then have been resolved.
That thread is from 5 years ago. Its likely that whatever issues they had then have been resolved.
#44
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Thank you for your interest. The SUM-8719 Stage One High-Lift LS Vortec Truck Swap cam will be available for sale roughly Oct. 10 with shipments going to our Ohio, Georgia, Texas, and Nevada locations for immediate pickup. It would be perfect for what you're doing and will make a ton of additional power for the money. It has the same cam timing as the drop-in SUM-8712 at 209/217 112 + 1. I/C 36, I/O -6, E/C -4, E/O 42 and it nets -10 deg. overlap. We designed the lobe profile for compatibility with durable LS6 springs and it has .550 lift. As much as the lift helps, the LS6 springs will extend the rev range to match the cam timing. Power goes up as expected, but the ability to make strong power to 6500 adds a bunch of power under the curve and extends it out for better overall acceleration. It is priced at $259.99 like the SUM-8712 stage one drop-in cam. Once again, Made in the USA with USA steel on a Landis 3LB with a CBN diamond grinding wheel for outstanding lobe quality. It was important for us to release the part number and specs a bit early just in case someone bought a SUM-8712, but would have preferred the extra lift.
#45
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A higher lift version of Stage 2 Truck is possible. We're at .545 on the Truck Stage 3 and 4. Here's the conundrum. Going beyond .545 to .550 in the Truck lineup takes us out of LS6 beehive springs and the peace of mind of long valvetrain life that comes with them. Not to mention $73/set affordability. We're ALWAYS open to suggestions though. If people would like a .600 lift version etc., let us know what you would like to see!
#46
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The SUM Pro LS Truck Swap Stage 1 .550 lift version that will be released by Oct. 10. That part number will be a SUM-8719.
A higher lift version of Stage 2 Truck is possible. We're at .545 on the Truck Stage 3 and 4. Here's the conundrum. Going beyond .545 to .550 in the Truck lineup takes us out of LS6 beehive springs and the peace of mind of long valvetrain life that comes with them. Not to mention $73/set affordability. We're ALWAYS open to suggestions though. If people would like a .600 lift version etc., let us know what you would like to see!
A higher lift version of Stage 2 Truck is possible. We're at .545 on the Truck Stage 3 and 4. Here's the conundrum. Going beyond .545 to .550 in the Truck lineup takes us out of LS6 beehive springs and the peace of mind of long valvetrain life that comes with them. Not to mention $73/set affordability. We're ALWAYS open to suggestions though. If people would like a .600 lift version etc., let us know what you would like to see!
#48
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Go and look at people that ran Comp Cam trunions. They start to fall apart right away. Mine looked terrible after 3k. Lucky I caught it
My EPS Comp cam was on the way out after 7K just like what was mentioned in this thread. Good thing I checked that too. I have sworn them off
https://ls1tech.com/forums/generatio...comp-cams.html
My EPS Comp cam was on the way out after 7K just like what was mentioned in this thread. Good thing I checked that too. I have sworn them off
https://ls1tech.com/forums/generatio...comp-cams.html
#49
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I'm not going to argue about poor quality of Comp trunions and they've had some spring issues. But if your trunions were bad, that explains the cam wear. Also, comp sources their cores from the same place other cam manufacturers do. I'd lay more blame at overly aggressive ramps and mismatched springs. Although it's possible for a bad cam to make it to a customer.
When we do large runs of cams like we do, milling them to near-net before heat treat makes a lot of sense for multiple reasons. Custom grinds don't get dedicated cores, so that is a downside.
Last edited by Summitracing; 09-28-2018 at 08:12 AM.
#52
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I'm not going to argue about poor quality of Comp trunions and they've had some spring issues. But if your trunions were bad, that explains the cam wear. Also, comp sources their cores from the same place other cam manufacturers do. I'd lay more blame at overly aggressive ramps and mismatched springs. Although it's possible for a bad cam to make it to a customer.
Both were not used together on my car. When Trunions started to fail I pulled my Cam Motion cam out. It was fine. Comp sucks and never helped anyone when all of this happened. Their Trunions will fail. Period. No matter what the cam is used. I have yanked 8 sets of them from peoples cars in last 3 years and all started to flake.. If Comp is so good why did many Vendors including EPS,TSP dump them? Feel free to go ask them. I can't tell you how many Comp crap stuff failed on Vettes here in Florida just working at Ecklers. More than I can count.
#54
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We can't comment on anyone's decision making process, but it seemed the .550 and .600 were good targets...along with our .625 number on the Stage 4 automotive cams. The TFS-2500286 spring kit checks all the right boxes after the LS6 springs sign off. We mentioned on another thread this morning, but it's a Pacaloy dual with 160 at 1.800 seat, 395 @ .600 lift, 405 @ .625 lift. They are 1.050 @ coil-bind, so .661 lift isn't a problem if 1.8 rockers are used.
Last edited by Summitracing; 10-01-2018 at 02:18 PM.
#55
Question for Summitracing,
Did you do any valve drop tests with the SUM-8702 and 8704 cams?
Are both of the lobe profiles easy on the lifters/valve train?
I plan on installing one of these into a LM7 5.3 without fly cutting.
thanks
ET racing S10, th400, 4:11, spool, 3000#, 275 dr,
Did you do any valve drop tests with the SUM-8702 and 8704 cams?
Are both of the lobe profiles easy on the lifters/valve train?
I plan on installing one of these into a LM7 5.3 without fly cutting.
thanks
ET racing S10, th400, 4:11, spool, 3000#, 275 dr,
Last edited by Swansonic; 10-07-2018 at 05:29 PM.
#56
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Comp sucks and never helped anyone when all of this happened. Their Trunions will fail. Period. No matter what the cam is used. I have yanked 8 sets of them from peoples cars in last 3 years and all started to flake.. If Comp is so good why did many Vendors including EPS,TSP dump them? Feel free to go ask them. I can't tell you how many Comp crap stuff failed on Vettes here in Florida just working at Ecklers. More than I can count.
#57
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Question for Summitracing,
Did you do any valve drop tests with the SUM-8702 and 8704 cams?
Are both of the lobe profiles easy on the lifters/valve train?
I plan on installing one of these into a LM7 5.3 without fly cutting.
thanks
ET racing S10, th400, 4:11, spool, 3000#, 275 dr,
Did you do any valve drop tests with the SUM-8702 and 8704 cams?
Are both of the lobe profiles easy on the lifters/valve train?
I plan on installing one of these into a LM7 5.3 without fly cutting.
thanks
ET racing S10, th400, 4:11, spool, 3000#, 275 dr,
You may want to look at the SUM-8708 Stage 3 and the SUM-8709 Stage 4. Those have wider lobe separation and a little less exhaust split to make them clear more consistently. The "LS3" grinds Stage 3 SUM-8710 and Stage 4 SUM-8711 were also ground to maintain clearance...with the Stage 4 LS3 netting just a bit more than the standard Stage 4.
#58
Thanks for the reply SR.
I should have stated Victor Jr with Carb will be used in my first post...
I am leaning to the 8704 for ease of install, LS springs, etc.
The 113 LSA cams you mentioned with the Vic Jr and carb is a non issue?
The 5.3s I will be using are stock quality salvaged motors, not planning on removing the heads, just cam/springs and run them as is.
I should have stated Victor Jr with Carb will be used in my first post...
I am leaning to the 8704 for ease of install, LS springs, etc.
The 113 LSA cams you mentioned with the Vic Jr and carb is a non issue?
The 5.3s I will be using are stock quality salvaged motors, not planning on removing the heads, just cam/springs and run them as is.
#60
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Thanks for the reply SR.
I should have stated Victor Jr with Carb will be used in my first post...
I am leaning to the 8704 for ease of install, LS springs, etc.
The 113 LSA cams you mentioned with the Vic Jr and carb is a non issue?
The 5.3s I will be using are stock quality salvaged motors, not planning on removing the heads, just cam/springs and run them as is.
I should have stated Victor Jr with Carb will be used in my first post...
I am leaning to the 8704 for ease of install, LS springs, etc.
The 113 LSA cams you mentioned with the Vic Jr and carb is a non issue?
The 5.3s I will be using are stock quality salvaged motors, not planning on removing the heads, just cam/springs and run them as is.
The Stage 3 SUM-8708 has the same intake opening (read intake clearance) as the SUM-8704 and closes the intake valve four degrees later (46 degrees vs. 42), so we're going to move the powerband up. That will be fine with at 3500 converter and the extra .050 worth of lift helps too. All while keeping you in an affordable spring pack. If you're looking to keep costs low, the SME-k-14300 upgrade valvetrain kit accommodates the lift and has trunnions and other things to get it back together inexpensively and reliably.
If you're really on a budget, the TFS-16918 single beehives work with your retainers...and you could just pick up new keepers (SME-143008) and locks (SME-143009). The CMB-09-0029 cam kit includes front gaskets, seals, ls2 chain, balancer bolt and valve cover gaskets.