'63 340 HP Water pump pulley

[Michael Gill]

Good day Corvetter's
Can someone help me out on the correct casting number of the water pump 2 groove pulley on a 1963 327/340HP engine. The NCRS manual doesn't address this other than diameter? Thanks
Michael Gill

[Joe L.]

Re: '63 340 HP Water pump pulley

Michael-----

Well, it's not really a "casting" number since the water pump pulley is a fabricated, die-formed steel piece. The number on the pulley is a stamped number which denotes the actual part number of the pulley. For the 63 340hp application, the original water pump pulley was GM #3770245. Believe it or not, almost 40 years after it was originally installed on your car, this pulley is still available from GM under the original part number.

[Joe L.]

Re: '63 340 HP Water pump pulley

Michael-----

Well, it's not really a "casting" number since the water pump pulley is a fabricated, die-formed steel piece. The number on the pulley is a stamped number which denotes the actual part number of the pulley. For the 63 340hp application, the original water pump pulley was GM #3770245. Believe it or not, almost 40 years after it was originally installed on your car, this pulley is still available from GM under the original part number.