Im a gen 1 SBC guy so I dont know much about the mechanics of the LS1.

Need 5 things real quick to settle an argument with a guy. All LS1 info LS6 aside.

Block: Cast Iron or Aluminium

Heads: Same Question.

Crank: Iron or steel

How Many bolts are the main caps.

And what exactly is the displacement?

 

I'm not sure if I can answer the question about the bolts or crank but...

the block is aluminum as well as the heads. Displacement is I believe 346 cubic inches. Might be 347. I'm sure someone else will finish this up for me.

 

Damn, Im gonna lose on that part. I knew the heads were aluminium but I thought the block was cast.

while were at it can someone tell me the Bore x stroke?

 

346 all aluminum heads and block
6 bolt caps.....4 like traditional and one on each side
i THINK the bore is 3.89
no idea on the stroke

 

Block & Heads: cast aluminum.

Crank: not sure, but likely cast, not forged.

Main Caps: as stated, 6 bolt...........4 from the bottom, 2 in from the sides (needed for extra rigidity because of aluminum block).

Displacement: we had a BIG debate about this awhile ago, and because of the differences between metric and standard measurements, numbers range anywhere from 346 to 347 cubic inches, but it still rounds to 5.7 litres. I believe it's truly 346.'something', but regardless, it's somewhere around there.

Bore & Stroke: (relates to above): 3.9" (or 3.89"?) bore X 3.62" (or 3.625"?) stroke. Compared to the Gen-I 350, it's like a "stroker" engine sorta! (4" bore X 3.48" stroke).

Well, hope that helps.

 

Well it helps....some. But i have to admit defeat against the block thing. I have bet money that it was cast....Im glad I didnt

 

The other thing you should know is that pretty much NOTHING is interchangeable between Gen-I and Gen-III SBC's. The LS1-style engines (4.8L / 5.3L / 6.0L Vortecs and LS6) can all interchange parts like Gen-I small blocks could (265's --> 400's), but they're a totally new design. When you start looking at the differences though, GM really put some time into designing and building them. I'd say the heads probably flow better than anything they ever produced from the factory before, and the valve arrangement was even changed. Instead of EIIEEIIE, they're arranged EIEIEIEI, which I believe is how old big block heads were. Also, they come factory with roller rockers and hydraulic roller lifters, and the individual coil pack ignition is a great system IMO.

Aside from the increased horsepower output of the LS1's, I think why they work so well in the F-bodies compared to the LT1's is probably because of the weight saved by using an aluminum block and heads instead of the cast iron parts of the LT1 (just my $.02).

 

you win then. it is cast. it sure isn't billet or forged aluminum.

 

No if you go back and read the beginning post the question was cast IRON or aluminum.

Like he said he would have lost.

 

i was just adding some humor to the post..

 

You still have a chance of redeeming yourself on this one. The block IS aluminum, but still uses Cast Iron Sleeves in the bore.

Hey, it's the 21st century, it's all how you PERCEIVE it, isn't it?

 

OK, I wasn't sure about that. I thought I heard they were aluminum, but then I've also heard that they were cast?!

 

I'm not sure, but i just glanced at all the posts and didn;t really see any real answers. Here's the low down. The LS1 is the mack-Daddy. It shares no parts with any other small block except for rod bearings i believe.

Block: Cast Alum

Heads: alum with countless millions in fluid dynamics research make these heads some of the best right out of the box.

Crank: Im not sure on the material, but NO ONE has ever broken a stock ls1 crank. it will handle over 900 hp out of the box.

Mains: 6 bolts like mantioned above (4 in the bottom, and 2 in the sides)

Displacement: 346 cubic inches. Bore: 3.898" Stroke: 3.622"