pizza442

My 72 455 has the common 399404 KF pulley as it came with a 3 core rad but I put a 4 core in. Should I bother to swap in the smaller HD 5 3/4 overdrive pulley or is there no need. Plus, what are the pro's and con's of doing this as well as pro's and con's with keeping the KF?

joe_padavano

The pulleys need to match the water pump, not the radiator. Unless you change to the 6.1" water pump used with the HD cooling option, that pulley won't line up with your crank pulley.

pizza442

Oh that's right, I forgot about that. So I assume the new repro's by Parts Place, etc. are still measured to match as the factory parts did....

joe_padavano

Not a clue about repros, but if they don't reproduce the features of the original, they wouldn't be reproductions, would they?

Koda

I think he means how accurate of a reproduction are they.

I suppose the hose connections are in a slightly different spot if the tank is thicker, but the hose should be able to accommodate that. I went from 2 core to 3 core in my Chevy and used the same hose part numbers. The 67 took the same hose when I put an autozone special in it.

That Chevy radiator was an NOS Harrison. Working with it was great. The drains worked! Everything lined up except the small block shroud needed a little trimming on one side for the thicker tank.

pizza442

1968-73 Oldsmobile Cutlass 442 3 Groove Water Pump Pulley W/ Air Conditioning

Brand new 1968-73 Cutlass/442 3 groove water pump pulley with AC. Fits all 350, 400, 455 motors and W30, W31 & Hurst Olds. Has 3 grooves with a 5 3/4" diameter and 3 3/4" height/depth


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