I need help identifying this pulley. This pulley should be a "KF" coded P/N 399404 pulley for my '70 442 w/ A/C and PS, per the GM assembly manual. The end of the part number after "3994" has been removed by the balancing circle, and the pulley code too.

Pulley O.D. is 6.125", the overall heigth of the pulley is 2.60", and the width of all three belt grooves is 1.90".

Is this a 399404 "KF" pulley???

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Yes. 99% sure of that.

All the other olds pulleys are usually

6.4,5.7, or 7.3 width.

KF are the only ones that are 6 1/8" that I know of.

 

Thanks J-, I just wanted to make sure if my time would be better used finding the correct water pump pulley, but since it is the correct one I will continue with the bead blasting and painting of this pulley.

The pulley grooves aligned-up perfectly with the crank pulley, but there is very little space (about 1/8") inbetween the water pump pulley and the crank pulley.

The pulleys being so close together had me concerned that this may be the wrong water pump pulley for my application. Is this normal for Oldsmobile 455s???

 

Yes, they don't have much clearance in between the 2 usually.

 

For what it's worth:

1970 cars with A/C or HD cooling or any other option which forced the 4-core radiator and fan with thermal clutch provided overdrive to the water pump. That means the water pump pulley is smaller than the crank pulley.

Cars without the themal clutch fan provided underdrive to the water pump. That means the crank pulley is smaller than the water pump pulley.

 

Hi. When I restored my 1970 W30 equipped with A/C I took pictures of all the parts...codes. The pulley you described does exist. I have a picture that I will upload.

 

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They look identical, except they removed material from mine right where the part number and pulley code was stamped to properly balance the pulley.

Even the "L" impressions at each end of the stamping from the edges of the gang stamp hitting the radius of the pulley are identical.

virtualwsp, do you have a photobucket account that you would be willing to share with me from your restoration? This would be a great help to me for identifying parts. I have looked a long time now trying to find detailed photos of a 1970 restoration.

 

I cleaned these up today. They do not have any drill marks like yours