409/409

Were all power steering pump pullys cast iron and 2 groove on 427's regardless of other accessories?
What is the correct part number?
Thanks

JohnZ

Nope. All 427's used the same power steering pump pulley - cast iron, 3 spokes, 2 grooves, P/N 3878245. See your Assembly Manual, section N40, sheet A7, item #9.

409/409

There are 3 on ebay with this part number 3878245 and they are 2 groove cast iron with 3 spokes. Claimed to be 427 pullys. I am confused???

Mr D.

So am I , mine is cast iron?

409/409

N40, sheet A7 shows belt arrangement for and notes L-72 and C-60. It does not show L-36 without C-60. Is L-36 and L-72 the same 3 belt arrangement?
Thanks

mark6669

I have never seen anything but the 2 groove cast pulley on a 427 corvette thru at least 72.
Mark

JohnZ

Oops! Must have been thinking small-block; the big-blocks used a cast iron 2-groove 3-spoke pulley. I edited my original post above.

67*427

Most of the suppliers have the description of the pulley wrong. The typical (and incorrect) description is "Power steering pump pulley, cast iron. All B.B., 2 groove, 6 1/8" O.D. Use on pumps with tapered pulley shaft and lock nut." When I needed one of these pulleys, I called several of the suppliers and they ALL said the pump shaft was tapered. Not so! I called Ernie at Wilcox and he was POSITIVE it was a tapered shaft since he had done several installs himself. I ordered the pulley from him figuring I'd have to change the shaft in the pump. Well, it came and was a for a STRAIGHT (NOT tapered) shaft... thus the need for the key that most of the suppliers show as needed with the pulley. After that, Ernie agreed it was a straight shaft and now HIS description is the only one that I know of that is correct.... "Power steering pump pulley, cast iron. All B.B., 2 groove, 6 1/8" O.D. Use on pumps w/straight pulley shaft and lock nut. OEM part number 3878245"

Steve