Accordng to High Performance Pontiac Magazine, all 2001 and 2002 LS1 F-Bodies come stock with an LS6 Intake Manifold. Can anyone back this up?
Also, according to GM High Tech Performance Magazine, select few LS1 F-bodies have a LS6 blocks. According to the Block ID# they gave in the Magazine, I have an LS6 Block. Can anyone back this up?

 

the 01-02 f-bodies do have the ls6 intake. i don't know anything about the ls6 block being in some f-bodies. you have me wondering now.

 

All 01+ F-cars have the LS6 intake, some 01+ F-cars do have the LS6 block, some have the LS1. It had to do with supply shortages I believe. Do a search on here, or on LS1.com. There was a thread about this a couple months ago.

The only real difference between blocks, to my knowledge, is openings in the bulkheads between cylinders. It supposedly relieves crankcase pressure at high RPM.

 

LS6 intake is on all 01+ as mentioned.
LS6 block is in a few (10%?) 01s and some (25%) 02s. The LS6 block has "improved bay-to-bay breathing", and has a different casting process & materials to make it stronger. Probably doesn't make a *huge* difference, but I'm sure it doesn't hurt.
I have the LS1 block... :/
good luck,
Shane

 

Yeah.Exactly what he said.

 

LS6 Block here if you look under the car right beside the bar code sticker on the underside of the engine there should be a cast in block number the LS1 is 12561166 on a LS6 its 12561168