Just got the 12Si pulley for the 454 but it came with a serpentine belt pulley.

I know you can take an impact gun and pull it off, but is there any difference among the different "V" pulleys to replace it? Does it have to be from/for a specific alternator other than a GM? Figure I can hit a wrecking yard or something somewhere, but need to know what to look for.

TIA!!!

-c

I put a 12si on my BB, the alt came with the serpintine pulley. I bought a repro deep groove 396 pulley off of Ebay. It bolted right up. You can sort of see it in the last engine pic in my signature link, but the radiator hose is in the way.