Jddaddy1

For my 327/300 63, I need a single water pump pulley. Do they have past numbers and/or date codes I should be aware of to get a proper one for my car? Thanks. Jd

rtruman

Make sure you are correct on this one everyone I talked to wants the
belt on second pulley out so as not to rub belt on bottom hose.
I just went thru this with a matching alt.

tbarb

You need a two groove pulley, I believe the part # ends in 659 (not 100%) and the alternator belt uses the forward groove. If you use the rear groove the belt can damage the lower radiator hose.

The lower crankshaft pulley ends in #043 and is also two groove and the alternator is like the picture above. All this assumes a 250-300hp engine but the higher hp engines use the same arrangement but the pulleys are deep groove and carry a different part #.

MOXIE62

My 327/300 pulley has part number GM3790356. It's a 2 pulley with belt on the outside. They seem to be pretty common as was used on several cars.

Jddaddy1

Man, you guys are the best. Thank you so much. Jd