So today I was working on an 06 Impala SS with the 5.3 and couldnt help but notice alot of similarities between this engine and the chevy truck 5.3's. So then that got me to thinking about if the block bolted to the transmission the same way as far as number/ placement of holes, could you bolt up an Ls1 to the impala SS trans and swap a fwd Ls1 into a vehicle if you so desired? This isnt something that I would ever think about actually doing but, I thought it would be an interesting conversation. And if anybody has any more info on this I would certainly like to hear it.