ls 376/515

[GMC70c20]

I am looking at engine options for my c10 and was thinking about a ls crate engine. I was lookin at the 375 cu in 515hp all aluminum model. I feel kinnda ify about that engine because of the block, how much power can the aluminum blocks handle before they warp or brake? and how long (assuming I dont beat the hell out of it) would this engine last? I listed the specs of the engine below

Part number:
19171225

Balanced:
Internal

Block (P/N 12584727):
Cast Aluminum with 6-bolt, cross-bolted main caps

Bore x Stroke (in):
4.06 x 3.62 (103.25 x 92mm)

Camshaft duration (@.050 in):
226 degree intake / 236 degree exhaust

Camshaft type (P/N 12480110):
Hydraulic rolller

Compression ratio:
10.7:1

Connecting rods (P/N 12617570):
Powdered metal

Crankshaft (P/N 12597569):
Nodular Iron

Cylinder heads (P/N 12598594):
LS3 rectangle port; as cast with 68cc chambers

Displacement (cu in):
376 cu in (6.2L)

Engine type:
LS Series Gen IV small-block V8

Pistons (P/N 19165089):
Hypereutectic aluminum

Maximum recommended RPM:
6600

Recommended fuel:
92 octane

Reluctor wheel:
58x

Rocker arm ratio:
1.7:1

Rocker arms (P/N 10214664 exh):
Investment cast, roller trunnion

Rocker arms (P/N 12569167 int):
Investment cast, roller trunnion

Valve lift (in):
.525" intake / .525" exhaust

Valve size (in):
2.16 int / 1.59 exhaust

[swb85]

You're a long ways away from having to worry about the block failing. There's guys running 800+rwhp on stock ls blocks. The cam will be the limiting factor in that package, it's barely using the head flow. The LS3 heads have a TON of potential and have as-cast flow numbers in BBC territory......throw a .650" lift cam in there and you're talking 600+hp easy. If you've got any lsx related questions I'd be happy to help.

[Super73]

Same here.. I have been tuning the LS1's since 2001 (For personal and friends) as well as building LS1 stuff for personal and friends for quite some time.

There are turbo cars going bottom as fast as bottom 8's on stock blocks and cranks. The l92 heads (LS3 heads) are incredible right out of the box (But you need at least a 4.00" bore).

My little 347ci motor with 3 year old factory (ported) LS1 heads is making 430rwhp through a 4L80E (heavy auto). This is with an off the shelf cam. I will be hitting this block/stock crank with a 300hp shot of N20.

[Alex1]

A top fuel has 8000hp, and it runs an aluminum block.

Like the others have said, the LS series block is more than tough enough for what you want to do.

[DieselEater]

I don't mean to be a wise guy or anything......But, a BBC will make more power, and be cheaper than an all aluminum LS project...Don't be mad at me, just trying to save you a few bucks...

A.........

[Super73]

Agreed, but a LS1 is A) lighter B) easier to get the most out of it with the laptop tuning and C) has a cool factor people love when you open the hood..

Back to ya, don't get mad.. It's different strokes for different folks..

BTW, I have seen a few 418ci LS1's making over 550-570rwhp. Thats on par with some of the more radical pump gas big blocks I have seen.