LS6 block in a Trans Am ??

[Intrepidman]

How can I tell if my car has one of the LS6 blocks?

I'm also very curious how many cars ended up with one of those blocks instead of the usual LS1 block.

[ntimid8r7]

The only way you can tell is by finding the part number on the back of the block. If I remember right there are no visuals to tell by. I thought that only late 02's got them but there were some 01's that got them too. Thing is there is no performance gains by having it.

[Orcus79]

Correct, on all the above, the block does give you gains though the extream upper RPM range though.