I picked up this LY6 with a few extra parts and wanted to see what you all thought about it. It supposedly came out of a 2007 NNBS 2500HD. Im guessing the VVT went out and that is my main concern. The piston tops all have minor gouges from the valves hitting them and I was told that it wouldnt be an issue. I just want a second opinion on it to see what you all thought. Are they safe to reuse or should I replace them with a set of flat tops? I dont have the heads or intake but if everything checks out okay I'll be buying a 24x reluctor wheel crank, rod bolts and a new set of rings and build the short block. Eventually I'd like to swap it into my OBS truck, but for now I just want to make sure its even worth the trouble. Thanks

 

I'd replace the pistons... And get a definite answer as to why that happened. Nice find for $200, though.

 

I was told that it went into reduce engine power and then this somehow happened... If I were to replace the pistons what factory replacement flat top could I use? Would LQ9 or LS2 ones work?

 

Not sure if you are looking for heads for this engine but I have a set of LY6 heads with Patriot Gold springs installed.

 

Yes you can use lq9 and ls2 pistons long as they are for floating rods.

 

Yeah I heard it went into reduced engine power and dude just stomped it to make it over the bridge.. I almost bought this too, wish I would have honestly!

 

Haha jvoisel... Thats what I was told!

Thanks for the replies. I found a set of new GM LQ9/LS2 pistons online the other day. A set of 8 would be $444 shipped.

I still need a set of rings. Ive heard good things about Mahle but Ive been reading up on rings and it seems that the LQ9 and LS2's had different ring packs. If i remember right the LQ9 had a 1.5mm, 1.5mm, and a 2.5mm but the LS2 had a 1.2mm, 1.5mm, and a 2.5mm. Which set of rings would I need?

 

those engines are suppose to have the valve marks on all the pistons, its added at the factory.

 

The valve reliefs are supposed to be there, the little nicks aren't. I'd just drop a whole LS2 rotating assembly in it and go..... However, the factory valve reliefs do make it nice if you want to push the limits as far as cam choice. For a daily driver, put some flat tops in it, a nice cam around .600 and never look back.