mattster03

iTrader: (22)

Trying to figure out what size pulley came on my head unit... the pulley has no stamped size/part# on it. Is the diameter measured at the bottom of the rib relief? Top? Maybe Middle?

Is there a certain formula that can be used? E.G. overall outer diameter minus 3/4" = pulley diameter? Thanks in advance!

LS1RedZ

iTrader: (19)

Thats weird there is no number stamped on it. Im sure Bob knows or give Procharger a shout.

ChevyChad

iTrader: (50)

Have you looked at both sides of the pulley? The number is always stamped on every one of them that Ive ever seen..

Awake455

They weren't always stamped. The measurement is taken on top of the ribs, not down in the grooves.

mattster03

iTrader: (22)

Yeah... checked both sides of the pulley. Not sure, it might be an "off brand" non-ATI pulley. Thanks for the info on measuring to the top of the ribs... looks like I have a 3.75 pulley! Good thing I have a 3.4 and 3.1 on the way

Bob@BruteSpeed

iTrader: (16)

I haven't ever seen an actual ProCharger pulley either that wasn't stamped. Bob

WhistlingZ

I have 3 pulleys that I got directly from Procharger that aren't stamped.

Bob@BruteSpeed

iTrader: (16)

Wow, I've never run into that. It would make it much harder for their shipping department to know what size to ship out. Bob