Fan Clutch # Help

[Earl G.]

Can somebody tell me the correct part number for a fan clutch for a 1967 427/400 A.I.R. car? The AIM shows #3814560 and opt. #3814137, but does not state for which engine. Also what is the difference between the two?

Gunner

[Joe L.]

Re: Fan Clutch # Help

Earl-----

GM #3814560 and GM #3814137 are both small block fan clutches. They were not used on big blocks. One of these is an Eaton-manufactured unit and the other is a Switzer-manufactured unit. Either one could have been used in PRODUCTION for 1967 small blocks, but I think that the 3814560 is the more common.

The big block fan clutch for 1967 was of GM #3857531. I think that this is an Eaton-manufactured unit with a coil spring type thermostat. I can't otherwise describe it to you, though.

[Earl G.]

Re: Fan Clutch # Help

Joe,

Thanks for the help. I figured if you saw the post I would get the right number.

Thanks again

Gunner

[Joe L.]

Re: Fan Clutch # Help

Earl-----

By the way, you won't find the GM part number on any fan clutch that I've ever seen. The most that you'll find is an ink-stamped broadcast code (if it hasn't long-departed). The broadcast code may not always be specific to a certain GM part number. It was designed to allow the assembly line folks to know what part to install for a certain application. If multiple parts could be used interchangeably for a certain application, all of those might have the same broadcast code. The idea was to keep things simple and NOT make things more complicated.