I have a water pump pulley and a crank pulley that I removed from my '67 SS.
I thought they might have been the original smog pulley but a reliable source has confirmed they they are not. :(
I even tried contacting GM Canada but they were unable to identify these GM part numbers.

I wondering if anyone can help I.D these pulley's:

Water Pump - 3900434AB
Crank - 3874418BS

These numbers are clearly stamped on each item. Both are double row pulley's

Thanks,

Chuck my parts book shows:
Water Pump - 3900434 64-65 All 8 Cyl
66 All with 325 and 360HP
396 eng. with 62 Amp
Delcotron.
68 All 6 cyl w/power
steering

Crank - 3874418 66 All with 325 and 350HP
396 eng. with 62 Amp
Delcotron.
68 All ST US jobs with 396
325 and 350 HP engine

Mike

Thanks Mike!

It was just that easy.... not really sure why GM Canada couldn't I.D them. Maybe it was just a lazy parts guy at the dealer who never bothered to check graemlins/angry.gif

Thanks Again!