Quote:
Originally Posted by Steve1968LS2
all the bosses are the same.. so anything that will bolt onto a 5.7, 6.0, 7.0 etc will bolt onto a 5.3L (and vice versa)
Makes picking a pulley system simple 
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just remember the iron blocks are not identical to the aluminum as far as front accessory drive bosses, though you can drill/tap enough holes to make most of the drive systems swap.
Jody