Will This Do it?
 

Have a 09 Silverado 1/2 ton, looking to make 550rwhp threw a 6LE60 give or take on 91 oct. truck is driven every day and tows toys during the summer

plan is
lq4 30 over
823 heads
stock crank
forged rods and pistons
9.75/10:1 compression
d1 procharger 8-10psi W/ air to water

walbro 525 with LSA FPCM flash


dont want to run any meth/ water injection,

i know a PD charger would be better for towing but i have a D1 kicking around and want to use it to stay cheap.

am i going to be close?

I made 477 with a P1 on a 5.3 and 12psi. Youre gonna smoke 500 no problem. Make sure you have the fuel for it.

anything done to the 5.3 to hit that number?

A basically stock motor with a cam will hold those power goals for quite a while. You're basically putting a lot more money into a motor that doesn't need to be there with those parts.

what do you mean?

the forged rods/ pistons?

with towing im thinking ill be in boost for longer periods of time and it would be cheap insurance. the 6.0 has to come apart any ways as it was from a wrecker

Yes, GM makes good stuff. I bought a core 6L from a guy for $250, pulled it apart and everything looked good. All I did was clean everything up, dingle ball honed it, put new cam bearings in it, opened up the ring gap and put it back together with a new oil pump and a Summit boost cam. Even reused the rod and main bearings after a little cleaning. Motor has 45lbs of oil pressure at hot idle and makes 375whp on my dyno NA. Fixing to put a couple turbos on it and push it to 700+. I expect it to live a long life there, and do lots of burnouts lol

that was my original plan, to use the stock bottom end. i just worry that stock pistons may not last under 10 min of boost well luggin 7k up a hill. i dont wanna be the guy waiting on a tow truck on his way to a poker run haha

Re-think your LQ4 choice.

That is the wrong generation engine if you want it to install into a 2007+ NNBS truck. The crank trigger, cam sensor location, knock sensor location and a few other things are all wrong compared to a GEN 4 block.

that i have to re check the block, its been sitting on a pallet for a year it looks like a few places makes kits to convert or i can rob stuff of my dying 5.3

any other input? for pump gas is 9.75:1 to high to boost with no meth or corn?

Depends on the level of boost. I built a 10.2:1 408 that is gonna see 6lbs and my tuner doesnt think its a problem. Id say less than 10lbs, youre fine. The LS2 is 10.9:1 and ppl run ridiculous boost on it all the time

Should be just fine long as the timing isn't too aggressive. 7 lbs would likely be a good choice but with 8-10 just a little less timing so a little less power out of boost but worth it.

changed plans a bit


lq4 30 over
823 heads un touched
stock truck intake with 50lb injectors
remap FPCM to LSA settings
stock crank
stock rods and weisco 4032 pistons
9.5/9.75:1 compression
d1 procharger 8-10psi W/ air to water
BTR stage 2 truck cam- the LS6 spring unit


still think i should be able to lay down 5XX ?

Still no problem. Ppl make more with less

The .03 overbore will increase compression, as will the heads. So is the ~9.5 you quoted taking into account the head CC and bore size?

Make sure you get the rotating assembly balanced, but 500 will be no issue at peak power rpm

with the smaller chambers im back on the piston search.

hard to find a decent 4032 forged piston

You have press fit rods? Is that the issue?

I did the math for you: 0 deck that pig, OEM gaskets on a 68cc head and 4.03 bore/3.622 stroke : 9.6:1 with a -10cc piston

should be easy to find a -10 4.03 piston, unless your issue is the pin diameter

the big hold ups are using a stock length rod 6.098 and a forged piston that is not 2618 forging,

why are you concerned with the alloy? hoping to avoid piston knock when its cold?

Truthfully, a hypereutectic aftermarket piston in a 4.03 will get you where you want to be too, and be much cheaper

TSP has affordable rod/pin/piston/ring combos. Sometimes they are $8-900 depending on sales and time of year

dont want the knocking as it is a every day use truck, will use normal D bag style driving abuse along with towing the toys in the summers, so figured id avoid cast and get some extra strength and avoid the noise

was looking at TSP kits but they all seem to be the 2618 forged - mind you i have not looked recently

The only concern I have with your plan and money spending is you are still rod limited to ~550rwhp on gen3 rods

I cannot comment on the cold start noise, as Ive pretty much felt any motor I built or had built made a little noise when cold. I just fear you're chasing a ghost here and still leaving the gen3 rods in and cutting yourself short on reliability

ill do rods and pistons


found a BTR stage 3V2 truck cam for cheap. for my power goals i wonder how it would do with boost?
218/224 .553”/.553” 110 BTR