Hey guys, I think I have a good question here: What are the Physical differences between an LS and a GSR block? Besides the obvious facts that its not vtec and doesn't have oil squirters, are there any physical differences? Could I put a GSR rotating assy in an LS block or are the main journal bores smaller/bigger? also height of the block? The reason I am asking is because I want to build my engine, but it's my daily driver, I have a gsr with a jackson supercharger on it and it uses an alternator reolcator and a few other things that I wanted to know if they would work on the LS engine. I know it won't work on a b16 because the block is physically shorter than a b18, but I didn't know about b18a/b to b18c1. I already have an Ls block that has been sitting in my basement and is in good shape, so could I put in a gsr crank and then use aftermarket rods and pistons for a gsr in it? Or would I have to deck the block. I can deal with losing the squirters and I have already built an ls vtec so I would just do that in order to put the gsr head on the block. Any imput would be greatly appreciated, GSR blocks are just so expensive and LS blocks are cheaper, that and I just wanna do it over the winter and then put the block in in one shot come spring without the downtime of putting the parts into my gsr block.