bryan23

iTrader: (3)

In the next few months i am going to get the rest of the parts to boost my lsx376 crate motor. If you don't know the specs on a lsx376 it is basically ls3 cam with ls3 heads and a ls3 intake, i have 2" stainless headers on it too. i have a d1sc procharger with a 3 core intercooler for my setup already, i just need injectors, pin crank, and a new bracket. here is a pic of my current setup.

My question is how much boost can i run on pump gas with 9 to 1 compression?
What size injectors? i have a 340lph pump in tank already with pro charger inline pump.

chance575

The rods in that are weak, I would watch out.

02blackbeauty19

iTrader: (22)

A guy on CF makes nearly 900hp with that motor, he claims. However, it is on race gas.

Engine bay looks really good.

kmracer

iTrader: (1)

when the rods do break, you can always post on every gm auto forum out there and start a law suit with GM....

IMO i'd just replace the rods.

Tirefire

iTrader: (1)

Get some meth for safety and see what it can make. You'll always have someone saying something. Just be conservative and turn the wick slowly!! I thought about going with that block before going with my AES 390 block.. Nice engine!!

chance575

This setup is a Ls3 in a LSX block. Its the whole package, crank, rods and topend. I spoke with Mike Thomson (I believe his name was) from Thomson Automotive (TA Racing engines) on last years power tour. He was driving a chevelle with a lsx block 454 with a ls9 top end.

I ask him specifically about this motor. He told me to stay away from some serious boost on it. Just like any OE engine it will take 8 psi with no problems. I was looking into the 14-16 psi range.

Engine type: LSX Series Gen IV small-block V-8
Displacement (cu in): 376 (6.2L)
Bore x Stroke (in): 4.06 x 3.62 (103.25 x 92 mm)
Block (P/N 19243171): LSX cast-iron with 6-bolt cross-bolted main caps
Crankshaft (P/N 12597569): Nodular iron
Connecting Rods (P/N 12607475): Powdered metal
Pistons (P/N 12166957): Forged aluminum
Camshaft Type (P/N 12603844): Hydraulic roller
Valve Lift (in): 0.551" intake / 0.522" exhaust
Camshaft Duration (@0.050 in): 204° intake / 211° exhaust
Cylinder Heads (P/N 12615879): Aluminum L92 style port; "as cast" with 68cc chambers
Valve Size (in): 2.16 intake / 1.59 exhaust
Compression ratio: 10.7:1
Rocker Arms (P/N 12569167 int): Investment-cast, roll trunnion
Rocker Arms (P/N 10214664 exh): Investment-cast, roll trunnion
Rocker Arm Ratio: 1.7:1
Recommended Fuel: 92 octane
Maximum Recommended RPM: 6600
Reluctor Wheel: 58X
Balanced: Internal

old motorhead

iTrader: (10)

How weak are the rods? The rest of the motor looks pretty stout. I wonder why GM would put such weak rods in a motor like this.

stock48

iTrader: (17)

Are those rods different than the LS2/Lq9? I can't imagen they would use a lighter duity rod in that engine than production trucks.

old motorhead

iTrader: (10)

I think they are the same. Stock powdered metal sounds pretty wimpy, but I've seen these rods on some pretty stout builds. I just wondered if anyone has any actual data that would quantify how good (or bad) these rods actually are.

slow67

iTrader: (2)

There is a guy on yellowbullet (Frank02L) that went 5.72@126 at 3280lbs with a stock 2005 6.0L bottom end......2005 and up motors should be the same rods as the LSX376.

stock48

iTrader: (17)

The LS2 style rods are pretty tough if you don't get greedy with the timing. I've been over 130mph 1/4 mi in my 4875 lb 4x4 truck with a 05 lq4 as well. At 126mph a set of the early 6.0 rods bent and broke on me. The ls2 rod isn't the optimum rod for big power, but their a lot stronger than credit given...

bryan23

iTrader: (3)

so would 12 psi be ok without meth?

stock48

iTrader: (17)

I wouldn't chance it unless you mix a little e85 in there or something. Also need a good AFR gauge and keep your eye on it.