86_irocz-28

iTrader: (5)

Hi guys new to the site got a 5.3 out of a 03 avalanche 92xxx miles got it for $335 this thing is clean!!!





Plans for it is to be street strip motor 400 at the crank is the goal where do i start what cam, heads, going to be using an ls6 intake what injectors should I use anything else I need? Sorry for all the ?s but im new to lsx's and motors in general ive swapped heads, intake, and carb on an older sbc and no I dont want a shop to do the work I want to learn

86_irocz-28

iTrader: (5)

So far ive already stripped off the accessories, exhaust manifolds, intake, cleaned the valve covers this is going into a 3rd gen camaro Ive done the research on what I need for it to fit so got that part covered

madmike9396

iTrader: (29)

car craft magazine tested every factory lsx cam in a 5.3 and the factory ls2 cam made 400 hp 400 tq at the crank ! you can get factory cams pretty cheap around here. but they is a lot more power to be had from a aftermarket cam

86_irocz-28

iTrader: (5)

Thats just cam only???

86_irocz-28

iTrader: (5)

bump..

86_irocz-28

iTrader: (5)

Think im going to do LS6 intake/cam/valve springs/pushrods with Lt's borla exhaust and a CAI

Blackpanther99

iTrader: (8)

What size cam?

86_irocz-28

iTrader: (5)

not sure thinking just a stock one

hagajames

Hey 86, you the same guy from nagca.com? If so hi! Also, I just my 5.3 too, same boat as you.

86_irocz-28

iTrader: (5)

nope on TGO though

86_irocz-28

iTrader: (5)

****!!!!

madmike9396

iTrader: (29)

straight from the Magazine. cam only swap

Baseline 5.3L LM7 Made peak hp 353 @5200rpm Peak TQ 384 @4300rpm

LS1 Cam in the 5.3 LM7 Peak HP 382 @5500RPM PEAK TQ 389 @4800RPM

LS2 Cam in the 5.3 LM7 Peak HP 403 @6100RPM PEAK TQ 399 @ 4900RPM article said this was the only cam they had valve float with past 6100rpm

LS3 Cam in the 5.3 LM7 Peak HP 405@ 6100 RPM PEAK TQ 398 @ 4900RPM

LS6 Cam in the 5.3 LM7 Peak HP 376@ 5900 RPM PEAK TQ 389 @ 4500RPM

LQ9 Cam in the 5.3 LM7 Peak HP 376 @5900RPM PEAK TQ 389 @4500RPM

L33 Cam in the 5.3 LM7 Peak HP 362 @5300 RPM PEAK TQ 387 @4500RPM

LS7 Cam in the 5.3 LM7 Peak HP 422 @6300RPM PEAK TQ 395 @5000RPM

LS9 Cam in the 5.3 LM7 Peak HP 420 @6200RPM PEAK TQ 393 @5100RPM

LSA Cam from the SC CTS-V in the 5.3 LM7 Peak HP389 @5600RPM PEAK TQ 394 @4800

here are 3 custom cams they tried also !

duration 200/200 Peak HP 380@5400RPM PEAK TQ 401 @4700RPM

duration 210/218 Peak HP 411 @6000RPM PEAK TQ 406 @4700RPM

duration 224/232 peak HP 442@6200RPM PEAK TQ 412 @5000RPM

I hope this helps !!!! of course they changed the springs out to accommodate for the higher lift cams. you can get those factory cams cheap on here.

86_irocz-28

iTrader: (5)

Gm claims baseline on this motor is 285hp at the flywheel(lm7 out of 03 avalanche) how the magazine got there baseline test i dont understand

madmike9396

iTrader: (29)

they took the LM7 and put it on the engine dyno ! all LSx motors are under rated

madmike9396

iTrader: (29)

Take for instance the ls1 is rated at 325 flywheel and it puts almost that to the rear wheels of a Fbody

86_irocz-28

iTrader: (5)

was there a reason gm did this?

86_irocz-28

iTrader: (5)

Would a ls6 rods and springs handle the lift of an ls7 cam?

madmike9396

iTrader: (29)

Gm did it for insurance purposes I would imagine !

Not sure about the ls6 rods and springs. Use the Search they is a ton of info on this forum.

00MaroonZ28

iTrader: (3)

Go all out and turbo it! 700+rwhp easily

86_irocz-28

iTrader: (5)

budget just doesnt allow for a turbo build just yet and ig ill just have to dyno it for sure after its done