How much does a stock ls1 block weigh?

 

I would think it to be less than 100#.

 

very light.

 

I would guess 90-100 pounds.

The 2003 GMPP Catalog lists the block, but doesn't give it's weight. Most of the other aluminum small blocks listed are in that range; and the ZL1 aluminum big block is 110 pounds.

EBS

 

SDPC lists the GMPP CNC block @ 90 lbs. So I would say 90 to 100 lbs.