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Hello,
I am building a sbe genIII 5.3 with a Gen2 7875 billet turbo and t56 magnum. 862 heads. Turbo has 2.25" crossover hotside into divided 1.25 AR housing. Dorman LS2 intake manifold. 4 inch single exhaust all the way out the back. Large Treadstone TR1245 FMIC. Car will be about 2900 lbs. 3.31 gears out back. M/T ET Street S/S 275/50r15. Will be running e85.
Car is 99.9% street car.
I was recommended the LS9 cam and also the Summit Ghost cam 8715R1.
For your application the Richard Holdener saying of every cam is a turbo cam applies perfectly. The factory 5.3 cam will work with a valve spring upgrade. I would stick with something small like a stage 1 from anybody. You also don't need to limit yourself to the "turbo cams". The ls9 cam isn't the move IMO, the ghost cam would be my choice between the 2 listed. There's also the sloppy best cam, or the old SS2 or the less popular SS1. Trucknorris cam from btr, your options are wide open
Hello,
I am building a sbe genIII 5.3 with a Gen2 7875 billet turbo and t56 magnum. 862 heads. Turbo has 2.25" crossover hotside into divided 1.25 AR housing. Dorman LS2 intake manifold. 4 inch single exhaust all the way out the back. Large Treadstone TR1245 FMIC. Car will be about 2900 lbs. 3.31 gears out back. M/T ET Street S/S 275/50r15. Will be running e85.
Car is 99.9% street car.
I was recommended the LS9 cam and also the Summit Ghost cam 8715R1.
Any thoughts appreciated.
I and many people I know have use the 8715 and it is a very nice cam. It idles with a mild lope, is very streetable, and have -2 degrees of overlap.
If you want lots of chop with a mild profile, I'd recommend the Brute Speed FI cam.
I run one in my current car, it has a nice lopey idle, the profile is pretty tame, so it won't kill valve springs regularly and has very little lifter noise.
For me, 275's, 3.31 gears, and a stick car, I would prob. prefer a milder cam, not have to rev it and slip the clutch when you take off, lol. I had a 5.3, 78/75, it had a GT2-3 cam, pretty mild, great driver, still made
500/500 with 93, mild tune. It was an auto, I could lock the converter at low RPMs, it would still accel. The cam was actually a Lingenfelter SC cam he used in the vettes.
I'm into sleepers and reliability, so I chose a small cam for my 6L 7875 combo . You mentioned the triple 12 earlier, mine is from Cam Motion and very similar to it
trip 12 is 212 /212 with 112 lsa and about. .560" lift , mine is 214/214 113 lsa .570 / .550 lift . You would have to custom order a triple 12 ( not that difficult) or contact JFR who sells them I think. I did not go over all lobe specs like I usually do, just went with there " gentle lobes " and so far so good 25k miles on 180k lifters and pushrods. Keep the lift under .600 and you can use pac 1218s and stock retainers / locks . Idles at ~16.5 inches vac @ 700 rpm in gear , worked fine for street driving with a stock 4l80e converter in a 4500lb truck with 3.73 s and 30 inch tires. Cruise up a hill at 1500 rpm locked up in OD . Don't really work it below 1250 rpm because of auto shift points but I'm sure you could with the manual. Now 6L vs 5.3 changes things a bit but so does 2900 lbs , without doing the math your gear /tire combo isn't far off mine in terms of overall rpm / mph . Your power goal would be easily achieved. I would think you could run any of the 212/218 112 ish cams with. 550 lift and have similar results. Hope this helps
The SUM-8728R1 212/218 110 would work similar to the Triple 12 and they consider it a Stage 1 for a 4.8L Turbo. The SUM-8720R1 218/227 is considered a Stage 1.5 for a 4.8L (which would act more like a Stage 1 in the larger 5.3L).
This Cammorion cam would be nice for you combo - give them a call, easy to talk to and they could prob reccommend something better...
Grind # XA220/355-XA232/350-17+5
Performance
Duration at .050: 220/232
117 Lobe Center Angle with a 112 Degree Intake Centerline
Lift with 1.7 Rocker Arm Ratio: .604"/.595"
Recommended Displacement: 4.8-6.2 Liter Engines
Recommended Compression Ratio: 9:1-10.5:1
Recommended Headers: OEM Manifolds or Racing Turbo Headers
Recommended Stall Converter: Stock to 3000+ RPM
Recommended Rear Axle Ratio: 3.42 +
The LS TT 220/232 Turbocharger LS Camshaft is a performance camshaft for vehicles using 4.8-6.2 liter LS engines equipped with an appropriately sized turbocharger(s) targeting mild to moderate boost and power levels.The LS TT 220/232 Turbocharger Camshaft will have a mild, nearly smooth idle and strong mid-range power and torque. This camshaft is a great choice for performance providing strong power yet still maintaining excellent drivability. This camshaft will benefit from a vehicle with free flowing exhaust, optimum high stall speed torque converter and optimum final drive gearing. Valve spring and pushrod upgrade are required.
My buddy has a 01 z06 cam and springs that I can have for free. Seems like a good option - but even more so considering the cost. Can always throw a bigger cam in it later.
204/211; .525/.525 ;CL:118/114; LSA:116.0; Base Circle: 19.3mm
From my research, it looks like the factory LM7 cam has the same base circle as the LS6? Can anyone confirm this? There was some conflicting information online.
My buddy has a 01 z06 cam and springs that I can have for free. Seems like a good option - but even more so considering the cost. Can always throw a bigger cam in it later.
204/211; .525/.525 ;CL:118/114; LSA:116.0; Base Circle: 19.3mm
From my research, it looks like the factory LM7 cam has the same base circle as the LS6? Can anyone confirm this? There was some conflicting information online.
The base circle size is kind of irrelevant. You can only make the lobes so big before you can't physically get the cam into the hole in the block. If you want more lift than that, you have to make the base circle smaller. Smaller base circle may mean longer pushrods.
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Recommend a cam for my setup 
