Not an LS guy, but the rockers are very similar as well as upper block layout regarding lifter valley and head gaskets. No, not a copy but similar. Chambers are also similar, but of course the slightly canted valves and valve arrangement are different. The head construction looks like an adaptation of the mod motor design for this engine. Just what I noticed. Didn't say it was a copy. Just that there are a few things that are similar.What do you se that similar to the LS?