63/340 upper pulley

[Jim Cear]

Just recieved an "NOS" upper pulley from LIC. the finish is bare cast metal(black). Can someone tell me if that finish is correct? Second should the lower pulley and idler have the the same bare metal finish? Don't have my JG with me. Thanks.

[Tom H.]

Re: 63/340 upper pulley

JG states idler pulley may have black phosphate finish. Early cars have been reported to have a cad or zinc finish on the idler.

It also states water pump pulley is gloss black or are plated with dark green or black phosphate finish. The same is stated for crankshaft pulley.

This info is from page 90-91 of the fourth edition JG.

Tom

[Loren L.]

Reliance on the 63-4 JG is risky *NM*

[Loren L.]

Reliance on the 63-4 JG is risky *NM*

[jim cear]

Re: Reliance on the 63-4 JG is risky

Meaning?

[Joe L.]

Re: 63/340 upper pulley

Jim-----

If by "upper pulley" you are referring to the waterpump pulley, that was NEVER a cast iron pulley for ANY Corvette application. Water pump pullies were always stamped steel.

The original waterpump pulley for your application was GM #3770245. This is DEFINITELY a stamped steel pulley. All of the originals that I have seen were black phosphate finished. However, I wouldn't rule out that some were painted semi-gloss black. The 3770245 was available from GM until a few years ago. ALL of the later SERVICE examples of this pulley that I've seen were painted semi-gloss black or powder-coated black.

[jim cear]

Re: 63/340 upper pulley

Joe, thanks for the clarification. The box I recieved it in( yes , its the water pump pulley) from LIC shows 3770245 as you stated and the pulley has the same number stamped on it with a "cc" at the end. Must be the real deal, yes?

[Joe L.]

Re: 63/340 upper pulley

jim-----

It might be a reproduction. Does it have "GM" stamped anywhere on it?

[Jim Cear]

Re: 63/340 upper pulley

Hi Joe, couldn't find a "GM" mark on it just that "cc" after the part number. Don't know if Covette Central remanufacturers parts but the initials work.