From what I have gathered over the past few months of reading posts. I thought the LS1 and LS6 were the same block and internals with just different heads/cam/intake.

 

Almost. The LS6 block has some extra windows for better breathing. You can read about the difference here. The LS6 block does not, in and of itself, make any more horsepower than the LS6 block. In fact, most engine builders prefer the LS1 block for strength in extremely high horsepower applications.

Some 2002 LS1 cars were built using LS6 blocks. I haven't had a chance to see if I lucked out yet.

 

lol according to scott's posting right here all 01's and 02's have the same block.

 

I don't know which one is Scott, but either Scott is wrong, or you interpreted him wrong.

Switching out one for the other will not get you more or less power -- maybe that's what you read. The castings are slightly different, though.

 

Scott S works at GM. I think I'll believe him over you when he calls it a legend

 

Ohhh, that Scott.

Well, I can pretty much guarantee you that Scott didn't say that the LS1 and LS6 blocks were identical, because they're not. There are pics on ls1tech.com -- I linked to them a couple posts back.

 

No he said all 01-02 f-bodies have the same block

 

some 01-02 fbodies have the ls6 block... know that for a fact, was a small percentage, but they are out there...

cory

 

He misspoke, or was misinformed. A small fraction of '02's got true LS6 block castings, verifiable by the casting number, or if you really want to be sure, you can tear the engine down and see the additional windows in the block for yourself.

Since the casting number itself is part of the cast, there is no way that an LS1 casting would get an LS6 part number on it.

 

Agreed, there were SOME LS1s in '02 (and I thought a few in '01 as well? ) that came with the TRUE "LS6" block. Very small number, but not a "myth" or "legend".

As far as the question about putting LS7 heads onto an LS1, I don't think it's physically possible because of the size of the valves, and the fact that they would contact the top of the cylinder bore (which is 4.125" compared to only 3.89" of the LS1). However, a re-sleeved LS1 block should be able to accept them .