I was never able to figure out if i have the ls6 block on my T/A. I tried multiple times to find that number on the back but I never found any numbers. Theres a sticker that says something and a 3 digit number somewhere but no long part number. '

Can anyone tell me exactly how they found their number? My car is jacked up very high at the moment so now might be a good time to look. I know theres really not much benefit but I would like to know.

Any other ways to find out btw?

 

Look at the front of the block in front of the head on the passenger side. LS-1 blocks have what are called "bullsey's" on them. Kinda a round circle within a circle. LS-6 blocks are just flat machined aluminum. This is on the portion of the block deck that prtrudes from under neath the head. I could see my number from under the car. A flashlight was needed, but it was above the tranny, just below the bottom of the head on the back of the block.

 

Yep on the drivers side...

 

You have to really get your head up there to see it. The "bullseye" method only works to positively identify an LS1 block,"bullseye" 100% LS1 block. The "bullseye" is a foundry stamp from the foundry that only made LS1 blocks. The smooth surface only means the block came from the foundry that makes the LS6 block, the problem is that they also made LS1 blocks with the same smooth surface. Checking the casting number is the only way to know for certain whether or not you have an LS6 block.