The new LS1 shares zero parts in common with the old 350. In fact, it's not even a 350. If I remeber, it's practically the same bore stroke as a 347 stroker kit for the 5.0.
The entire engine is different.
The old LT-1 and the IROC motor however are pretty closely related. Different heads intake cam and all that junk still though.
I've never had a problem stomping the old IROC. Not even close.
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