LS2 v LS3
 

So as some of you may know, I'm leaning towards doing a LS conversion in my 68 Acadian. I was going to get a motor from the states, but I found a place in Vancouver that has great prices on LS crate engines from GM. I've been looking at aftermarket parts for the engines and found that the LS2 has way more than the LS3. A few of the parts say they are for both. One thing I was looking at was a March pulley kit for it. The one kit says it will fit the LS1, 2 and 7, but not the LS3. I was also hoping to be able to use one of the Weind polished LS1 intake, but now I don't think it will fit.

What are the differences between the LS2 and LS3? Am I better off going with the LS2 for aftermarket parts? Which ever one I go with, I plan on putting in a new cam and some other performance mods. Any advice would be greatly appreciated as I don't know much at all about LS engines. Thanks.

me personally from what iv read and heard LS3
Ofcourse get urself over too LS1tech start searching and reading first, then make your decision

I found a build for you to look at:
http://www.ls1tech.com/forums/dynamo...hp-513-tq.html
its not an Ls7

It is all in the heads. The LS3 / L92 heads are better then the earlier heads.

Frank can the LS3 heads be installed on the LS2?

THe l92/LS3 heads can be installed on a 6.0l (LQ4/9, LS2, LS3). Can't be put on a 5.3/LS1 style engine.

Yes, basically the L76 engine is a 6.0 ltre with L92 heads. I have a dozen of them in stock CHEAP! Only $3800

L92/LS3 heads can be installed on a LS2, but you have to use the L76/LS3 intake. There isn't any other intake on the market that will fit those heads. It is also the one complaint I have seen about those heads, the intake can't flow as much as the heads can. FAST has one coming, supposed to be soon, but I do not know when http://www.fuelairspark.com/WhatsNew/ . I don't know if Weiand has one coming or not. Other options would be having a LS3 intake ported or a roots style supercharger.

David

Thanks for all the info guys. The more I've been reading, the more I am leaning towards the LS3. Correct me if I'm wrong, but I guess the LS3 is one of the newer LS engines and that's why there isn't as much for aftermarket stuff right now. More add ons to come though I would imagine. I guess my decision now will be if I should get the 430hp version and put my own cam in it or get the 480hp version which has the GM hot cam upgrade. Thanks again guys.

Get the L76, put the cam in it and save a grand over any LS3!

And yes, the LS3 / L76 / L92 are all the newer engines with the newer heads.