I have a 2006 L33 5.3 that I am putting in a 2001 S10 Extreme. I am using the T56 with 3.73 gears. This is going to a daily driver that I plan to haul & tow light loads …not to exceed 2500lbs. I pulled my motorcycle & trailer with the stock 4.3 / 5-speed with a lightweight flywheel & stage 2 clutch with adequate results. The only issue was passing on the highway. I caused traffic jams when trying to pass semi-trucks at 60 MPH.

My question is: What is the difference in torque at 1500 to 2000 RPMs between the Stage 1 Drop In (SUM-8712), Stage 1 Hi-Lift (SUM-8719), & the Stage 2 (SUM-8701)?

I will be using the LS6 springs with either cams. I may also consider the Stage 3 truck cam (SUM-8713). I am also open to other cams, but I WILL NOT use anything other than a Summit Racing Pro LS Camshafts!

My concern is the very tall .50 overdrive 6th gear. My calculations are that I am going to be at 1708 @ 70 and 1952 RPMs @ 80 MPH with a 25.7” tire & 3.73 gears. I am going to need torque at those RPMs to move the truck on the highway. BTW - I will tow in 5th gear. For reference, my stock ’94 Z/28 5.7 LT1 did fine on the highway with the T56 & 3.42 gears and the same size tires.

I want to take advantage of the L33’s higher flowing LS6 heads (243/799) and the increased compression of the flat top piston (9.9 vs 9.5). But I am not interested in revving above 6200 RPMs so power below 6000 is my primary concern. The LS2 in my Trailblazer SS scares the bejesus out of me when I step on it and downshifts and revs to 6500+! And a loopy idle is always nice, but it may make getting the heavy load to move from a dead stop more difficult much like the light flywheel did on the V6.

Any suggestions of the three cams for my application and any comments for others considering the Summit Racing LS Pro truck cams for use with the T56?

Thanks, Shimaze

 

Pick the smallest cam from all that you listed.

 

Really dude? Take it easy over there.

 

You can actually delete or edit any of your posts. Hit the edit button at the bottom of any of your posts.

 

The SUM-8712 drop in and the SUM-8719 .550 lift version of that have an intake closing point of 36 degrees. The Tow cam version SUM-8718 is a drop in and has a closing point of 33 degrees to help build compression earlier and will help it pick up another 15-20 ft. lbs. in that off idle range through 2000 rpm and would be our first choice for what you are doing. Of course it's going to pick up power all the way through 6000, so you won't miss one of the bigger cams. Of course if you are using the LS6 springs and you want a bit more top end, the 8719 is a lot of fun. You're going to find it makes very good power down low too and the truck won't need to downshift going up grades, which will increase fuel mileage. Keep us posted!

 

Just wanted to follow up with results from the Summit Stage 4 turbo cam in a 5.3L. Summit cam has been working great, it replaced the LJMS/BTR Stage 3 turbo cam and car has consistently gone faster on less boost and timing.

As an added perk, it set the CTS-V1 and overall manual CTSV record with an 8 second pass at 4000lbs.

Have also logged over a thousand miles on the Summit Stage 2 turbo cam in a SBE 5.3 and has been working great as well. Valvetrain runs extremely quiet, builds boost fast and runs hard to 7500 so far.

Thanks for awesome parts at a great price point!

 

Hi! I've just recently received my SUM-8706-1DS cam and spring combo, the spring kit which is the Trick Flow TFS-2500286P, came with .015" thick shims. Do I need to use them? Or are they for a different specific application? I am going to use them on a 6.2 liter block with rectangular port heads. I've tried contacting trick flow specialties but they never answer calls or respond to messages. I also got their TFS-2500280 spring kit for my other build. I might just return all of them, if they will not respond to my very simple inquiries.

 

Yes, you need to use the .015" shims with the TFS-2500286P springs. This will put them at the recommended 1.800" installed height so they will have the correct seat and open pressure.

 

Got my 2013 GMC Sierra (RCSB) with 6.0 swap tuned on the dyno today and figured folks might be interested.

Originally a stock 4.8/4L60e combo with 50K miles on the engine/trans. Bone stock setup with just a 3.5" custom catback, it made 259whp on 87 octane on a dynojet in 2nd gear on the factory tune.




Once I got my baseline, I pulled out the 4.8 and swapped in a freshly rebuilt 6.0 L98 (aka L76). Stock engine with just a Summit 209/217 cam (SUM-8719) and GM LS6 springs. Everything else remained the same, made 355whp on 87 octane after tuning.




Truck pulls hard right off idle all the way redline and idles just like the stock 4.8 it replaced. I'm loving this cam!

 

Q8y drifter, Thank you for sharing your dyno results and your feedback. The SUM-8719 stage 1 high lift truck cam is the most popular of our three stage 1 truck cams. It is a good all-around cam for torque and power in a truck.

 

Seriously considering one of the LS Truck Cams for my squarebody crew cab dually (2wd) that is getting a 5.3 mated to a NV4500 5 speed manual with a ebay GT45 turbo. I frequently tow my 30', 8000lb (loaded) travel travel, and the truck is my daily driver.

Which cam would you recommend? The 8718 had my attention, but so does the 8712 & 8719 too. I don't plan on running more than 8-10 psi along with 31x12" core intercooler along with water/methanol injection.
.

 

Ford Assassin, that is a clean old C30 you have there. We would recommend the SUM-8718 stage 1 truck towing cam for your application. The specs on this cam are .500/.500, 205/217, 112+2. With your heavy truck that will frequently tow, torque will be your friend. This cam has the earliest intake valve closing event of our truck cams at 33* ABDC. This will help build great torque right off idle. It will carry power and torque strongly through 6000 rpm with the stock springs. If you wanted to extend that further, you could install budget-friendly LS6 NAL-12499224 springs. This cam will work well with boost and be efficient with its -12 overlap. While tuning, a low idle speed will net you a slight lope vs. a high idle speed for a smooth idle.

The bigger cams aren't really necessary with your application since you'll be able to increase horsepower as desired with boost.

Being that this is a Gen IV chances are good this has AFM/DOD, VVT or both. We have delete kits available for both of these.

AFM: If this has PCV then you would need CMB-09-0031. If it doesn't have PCV then you would need CMB-09-0030. These kits come with MLS head gaskets, valley plate, non-DOD lifters and guides, head bolts, water pump gaskets, and a harmonic balancer bolt.

VVT: For a 3 bolt cam you would need CMB-09-0027. This will include a non-VVT timing cover, 3 bolt 4 pole cam gear, ARP cam gear bolts, and a harmonic balancer bolt.

 

Crap, I pulled the trigger on the 8719 yesterday along with some BTR LS6 style springs.

Think I should exchange the cam for the 8718? I only tow 3-4 times a year. The truck is my daily, curb weight on the truck is 5900.

Thx.

 

No worries. The SUM-8719 will be a great camshaft for your application. It will lose a little off-idle torque with the 36* ABDC intake closing vs. 33* of the 8718. With its increased lift and duration it will make up for it with a very strong mid-range and top-end. The LS6 springs will help keep it stable past 6500 rpm. The 8719 will also work well with boost and maintain efficiency with its -10 overlap. It will make a great daily driver cam and work well towing with your combo. You may find the engine may not need to downshift as much going up grades with this cam. This would mean less rpm which means less fuel consumption.

 

I have a manual NV4500 transmission, cruising RPM at 60 mph is 1800.

How much torque you think I am losing with the 8719 vs 8718 under 2500 RPM?

Thanks.

 

Are the rumors true? John Bewley is going to Summit to be apart of the development side of things? Or just an internet rumor?

 

It would be around 15-20 ft. lbs. that you would be losing under 2500 with the 8719 vs the 8718.

 

That's not horrible. Worse case, drop a gear and get into boost. Lol

 

Yes, not all that much. Good plan of action in the event of a worse case scenario!

 

That is an internet rumor.