C2 Water Pump Pulley Need Help

[Michael M.]

Hi, Can anyune give the the current part number for a 1965 327 C60 ps water pump pulley.. The orginal number was 3995643 as best I can research. I know this may not agree with the parts manual but I got this number off an original car. Thanks, Mike

[Joe L.]

Re: C2 Water Pump Pulley Need Help

Mike-----

Believe me, the GM #3995643 was NEVER originally installed on a 1965 Corvette. I can tell you that with absolute, 100% certainty. The GM #3995643 pulley did not even exist until 1971, so it just couldn't have been originally installed on a 1965. If you found it on an original car, then I can tell you, for sure, that it was a replacement and not the original.

Assuming that the car is a 250 or 300 hp, the original pulley was GM #3850680. That pulley was replaced by GM #3890419 in June, 1966. In December, 1971, the GM #3890419 was discontinued and replaced by GM #3995643, the very pulley that you found on the car. GM #3995643 is now also discontinued without supercession.

[Michael M.]

Re: C2 Water Pump Pulley Need Help

Thanks Joe, The car that was suppose to be original was out at Arts at Bowling Green. I guess it wasn`t as original as I thought. I have three different water pump pullies and two different crank pully set up and none seem to match. I have studied the archives but it wasn`t much help either. It is a 65 350 hp with air and power steering. I will post my part numbers tomorrow night and maybe you or someone might have some ideas. Thanks Again for the info, Mike

[Joe L.]

Re: C2 Water Pump Pulley Need Help

Mike-----

I cannot be sure exactly which waterpump pulley that a 1965 L-79 with C-60 and N-40 used. However, I think that the original pulley was likely either GM #3850979 or 3848904. GM #3850979 was never available in SERVICE and I think that it's functionally the same as GM #3848904, anyway.

The 3848904 was discontinued many years ago and replaced by GM #3995641. That pulley is still available from GM.

It's also possible that the 1965 L-79 with C-60 and N-40 used the same waterpump pulley as I previously described. In that case, the GM #3995643 would be the correct, current pulley. However, if not, then I'd say that the GM #3995641 should work correctly. It almost has to be one of those 2 pullies.

[James W.]

Re: C2 Water Pump Pulley Need Help

Mike,

I'm holding the water pump pulley for my '65 327/350 C60, N40 equipped Corvette in my hand right now. The part number stamped into it is 3848904 with the letters CS just after the numbers. This is an original, unrestored car.

Hope this helps,

James West
Omaha, NE.

[Michael M.]

Re: C2 Water Pump Pulley Need Help

Great! Thanks James! I have been working on this for over a year. With your and Joes maybe I can put this pulley thing to bed. Mike

[Michael M.]

Re: C2 Water Pump Pulley Need Help

I know it might be asking a lot but do you have the correct bottom pulley and its part number. I think I have it but not for sure and its too valuable not to ask you. My car was totally stripped when I got it. Thanks for your time. Mike

[Joe L.]

Re: C2 Water Pump Pulley Need Help

Mike-----

I believe that the crankshaft pulley for your application was GM #3827843. This pulley was discontinued without supercession more than 25 years ago. I don't think that even the "Pulley King" reproduces this one.

[Michael M.]

Re: C2 Water Pump Pulley Need Help

Thanks Joe, I don`t have that one. I put a search on E-Bay in case one shows up. I might put an ad in the driveline also. I appreciate the information, at least I know what I`m looking for. Mike

[James W.]

Re: C2 Water Pump Pulley Need Help

I'll look tonight when I get home and let you know.

James West

[Michael M.]

Re: C2 Water Pump Pulley Need Help

Thanks James!

[Joe L.]

Re: C2 Water Pump Pulley Need Help

James-----

I'm very interested in what you find, too. Besides the part number, I'd be interested in the number of grooves, thickness (front-to-rear), and the OD of the pulley.

[James W.]

Re: C2 Water Pump Pulley Need Help

Joe,

I'll see what the number is and get some measurements. It probably won't be until Monday night.

Thanks,

James West

[Michael M.]

Re: C2 Water Pump Pulley Need Help

Its like waiting to open the Christmas presents. My wife is convinced that there is something truly wrong with me! She just doesn`t understand. Mike

[James W.]

Re: C2 Water Pump Pulley Need Help

Mike,

I'll try to get you the info you need tonight.

James West