I have been told that there is also oil return issues with the 5.3 truck engine/alum. head swap, but it is easily taken care of. Also the intakes are different, so you might need to check on that. For me as long as there are Pontiac engines, that is what my old Pontiacs will get. Now if I was fixing a newer GP or Grand Am and making it a streetible rwd, then the ls1 would maybe get consideration. But knowing me, and as the slap gm deserves, I'd still put a true Pontiac V8 in it.
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