1966 alternator pulley - where to find?

[Donald H.]

my 66 is an L79 no air & no power steering. In another thread the correct alternator pulley was identified as GM #3871242. When I look at pulleys available from the usual suppliers, it is difficult to decipher the descriptions.

Paragon normally cross references the GM #, but they don't have a Paragon part numer cross referenced to the GM 3871242.

LIC has a listing (see picture below) that is "ALT PULLEY (390-435HP NO P/S NO A/C,365HP A/C) 66-7 327/350HP NO P/S, NO A/C", so I assume this one is correct. They don't show the OD but from the photo it looks to be about 7/8" thick.

Does anyone know where to get a correct alternator pulley for my application? I'm happy to use a reproduction if I can just make sure I'm getting the correct one.

Does anyone have a picture to share of a correct one installed on a 66 L79 no air/no power steering?

Lastly, is there a separate fan that gets installed behind this pulley?

Thanks,

Don Harris

[Joe L.]

Re: 1966 alternator pulley - where to find?

my 66 is an L79 no air & no power steering. In another thread the correct alternator pulley was identified as GM #3871242. When I look at pulleys available from the usual suppliers, it is difficult to decipher the descriptions.

Paragon normally cross references the GM #, but they don't have a Paragon part numer cross referenced to the GM 3871242.

LIC has a listing (see picture below) that is "ALT PULLEY (390-435HP NO P/S NO A/C,365HP A/C) 66-7 327/350HP NO P/S, NO A/C", so I assume this one is correct. They don't show the OD but from the photo it looks to be about 7/8" thick.

Does anyone know where to get a correct alternator pulley for my application? I'm happy to use a reproduction if I can just make sure I'm getting the correct one.

Does anyone have a picture to share of a correct one installed on a 66 L79 no air/no power steering?

Lastly, is there a separate fan that gets installed behind this pulley?

Thanks,

Don Harris

Don-----


GM #3871242 is the correct pulley for your application. And, yes, there is definitely a separate fan installed behind the pulley.

[David L.]

Re: 1966 alternator pulley - where to find?

I have some detailed sketches w/dimensions of a 3871242 alternator pulley (post # 20, March 12, 2011) in the thread listed below.

Dave

https://www.forums.ncrs.org/showthread.php?t=85104&uid=2545

[Donald H.]

Re: 1966 alternator pulley - where to find?

I have some detailed sketches w/dimensions of a 3871242 alternator pulley (post # 20, March 12, 2011) in the thread listed below.

Dave

https://www.forums.ncrs.org/showthre...85104&uid=2545

Thanks,

I do remember seeing that thread before. That helps.

Don