jc10000rpm

Looks like the stage1 turbo cam and Big Torkinator are the same. Ill be ordering one in the next few days for a project car daily driver 2008 BMW 750LI with a LH8 all aluminum 5.3 turbo setup and a zf8hp70 trans. Im looking for great results (it is a heavy a** car)

Z28kid1969

New guy who has been lurking for awhile reading the Summit cam threads.

I have a 2012 Silverado CC 4x4 with the L9H 6.2, 6L80, and 3.42 gears. I don't tow a lot but would like a cam that didn't give much up at lower rpm. I plan on a convertor swap and long tube headers, and VVT delete. I was wondering if a 8728 or the 8720 would be a good fit or possibly a cam I'm over looking.
I would like a high lift (.600") cam to take advantage of the rec port heads.

FYI: I plan on doing the ls2 style tensioner, dual pac springs, hardened oversize pushrods, dual roller timing set, and new lifters with the cam swap.

Thanks

Summitracing

You're correct. The stage 1 single T4 turbo cam is the same as the Big Torkinator SUM-8728R1 that we list in the truck swap cams. Thanks for bringing this up. We put the incorrect part number for the "stage 1 LS turbo cam 4.8" in the T4 turbo cam chart. It should be the SUM-8728R1 "Big Torkinator" with specs of .600/.585, 212/218, 110+3 with -5* of overlap. We'll get that image/chart fixed to reflect the correct information.

Onto your 2008 BMW 750LI with the boosted LH8 5.3 swap. The SUM-8728R1 would be a great cam for the swap. That is a big ol' sedan to be lugging around. The early 33* IVC of the 8728R1 will help get the 750LI up and moving. Combining that with your 8-speed auto and boost will make this a great combo. It will be easy to get along with as a daily that could surprise some unexpecting folks! Pair the 8728R1 with our SUM-174004 .600" lift beehives and it'll be happy out to 6,500+.

Summitracing

Hey folks,

We wanted to let you know about our Pro LS cam GIVEAWAY we currently have running for LS1Tech members! Go check it out in our **GIVEAWAY** Summit Racing Pro LS Cam thread. Get entered in the GIVEAWAY thread for your chance to win a Pro LS cam for FREE or a gift card of equal value! We're accepting entries up until Monday, May 9th, 2022 at Midnight, Pacific Standard Time. Good luck folks

Summitracing

Thanks for checking in on the thread for a cam recommendation. You've got a good game plan in place for upgrades to your 2012 Silverado with the 6.2. Being that you have cubic inches on your side along with your other planned mods we'd lean on the SUM-8720R1 here. Specs on it are .600/.600, 218/227, 112+2 with -1* of overlap. It may a lose a bit off-idle to 2,000 RPM torque. However, it's not going to be a slouch down low and will make up for it and more come 2,200 on through the mid-range. It will be strong out to 6,500+ with .660" lift Trickflow TFS-2500286P duals. This would work just fine with a stock converter. If you wanted to add a stall converter we would recommend a 2,500+ stall converter. A converter along with long tube headers and a free-flowing exhaust would help get the most of the 8720R1. This would be a fun truck to drive around that would be easy to get along with. When you wanted to hook it up to a trailer you'd likely notice that the truck won't have to down-shift as much going up hills.

You'll want some upgraded pushrods. With our .600" lift cams, we typically see a 7.400" or 7.425" pushrod used. Things can vary so we always recommend measuring for pushrod length before purchasing pushrods. If you don't already have a pushrod length checker we offer the Trickflow TFS-9501. For pushrods, we recommend a minimum of a 5/16" Chromoly pushrod with a .080" wall. You can typically find a set of 16 for around $100. From there you can get into a thicker wall or larger diameter pushrod. For excellent stability and strength check out our 11/32" HDR pushrods with a .120" wall. These have 25% less stress and 28% less deflection than a typical 5/16" x .080" wall Chromoly pushrod.

We can help you out with the VVT delete. Check out our CMB-09-0027 VVT delete combo. That comes with a 3-bolt 4x cam gear. You could purchase individual VVT delete components from the Kit/Combo Contents tab. Regarding a timing set, we'd recommend a single roller vs. a double roller chain. The double roller chains tend to have clearance issues with the timing cover.We'd recommend a timing set like our SUM-G6647-4X or Cloyes CLO-9-3672TX9.Either of those timing sets would get you the 3-bolt 4X cam gear you will need to delete the VVT and work with a 3-bolt aftermarket cam.For lifters, we'd recommend our SUM-HTLSKIT3. This comes with Morel 7717 drop-in lifters, new lifter trays, and lifter tray bolts. When going with dual springs we typically recommend a trunnion upgrade for the rockers. We offer both the bushing and captured needle-bearing options in our own brand. We also carry the popular BTR V2 captured needle-bearing trunnion upgraded trunnions. The LS2 timing chain dampener would be GM part number NAL-12588670.

This should help you get the ball rolling with your cam swap. Let us know if we can be of any further assistance. You can reply to the thread or shoot us a PM. We'll be happy to help!

jonnyboy

iTrader: (3)

Summit, I have a 2000 silverado 2500 non HD 4x4 6.0 nv4500 5speed, 3.73 gears, 33 inch tires. This is not a toy, all tow/work truck. 4th gear towing 60 is around 2300 rpm, 5th gear cruise is around 1600 or so. I am after TORQUE for towing; being that it is a manual transmission, there is obviously no torque converter to multiply torque or help down low.
The plan is probably 706 heads on the lq4. Which cam would you recommend for absolute max towing in a truck that will likely never see 6k rpm?

Summitracing

@jonnyboy,

We see you sent a PM in as well so we responded to you there.

Damian

iTrader: (89)

Who cuts Summit Racing cams? Any details about their heat treat / hardening process? And I assume these are 5150 cores correct?

G Atsma

Much of what you ask is proprietary info. Especially who grinds them. Summit MIGHT reply to the rest....

conexion914

iTrader: (5)

Did you recommend the big truck torkinator and 91+ octane by chance for that combination?

Damian

iTrader: (89)

Who grinds them shouldn't be proprietary information especially if Summit themselves is doing it. And both Cam Motion & TSP whom I've been buying camshafts from for 20 years have no problems sharing their heat treat process or any other details about their product. I'm just curious if these cams hold up and don't fall apart in 10k miles like all the Comp 5150 stuff does.

jonnyboy

iTrader: (3)

Summit recommended the a choice between either 8727R1 "Torkinator", or if feeling sportier, the 8728R1 "Big Torkinator."

Also, 91 oct for either, due to compression ratio.

Summitracing

We appreciate your interest in the manufacturing process of our Pro LS cams. Per our private-label agreement, we cannot disclose the manufacturer. We can tell you that these are 5150 cores and are 100% made in the USA!

Check out this article on the manufacturing process of our Pro LS cams. We share quite a bit of info and images going from the 5150 core all the way through final testing.

There is a vast amount of testimonials all throughout the interwebs of happy customers using our Pro LS cams. There are many who have swapped Pro LS cams in more than one of their projects! Forgive us for we may be biased, but that sounds like our customers trust the quality and value of the Pro LS cams for their projects

Damian

iTrader: (89)

Excellent info! You guys are definitely offering a product that's hard to beat for the performance & the price!

Summitracing

We see @johnnyboy let you know what we recommended for his combo. If you'd like us to recommend a cam for your combo and goals reply to this thread or shoot us a PM. We'll be happy to help!