GM Pulley ID please

**Rixls6** · #1 03-14-2007, 12:33 AM

I have a GM Cast Iron P.S. pulley that is double deep groove that may be mis-boxed.
The part number on the box is 3941105. I thought that number was for a single deep groove pulley.
The only thing else that is on the pulley is "1A" "GM" and "2A".
Any ideas?

3macs1 · #2 03-14-2007, 12:38 AM

Wrong box for sure Rick. That box is for a single groove high Hp chevelle ps etc.

**Rixls6** · #3 03-14-2007, 12:46 AM

That's what I thought.
It's been in that box for a long time and even had a 1983 dated receipt in the box with it that had the part number 3941105 also.

**Fast67VelleN2O** · #4 03-14-2007, 12:51 AM

I know that fits 69 Corvette big block.... I have one for my 69

3macs1 · #5 03-14-2007, 01:40 AM

The cast one or the box???part number???

**Fast67VelleN2O** · #6 03-14-2007, 01:57 AM

The cast iron pulley... don't have a # handy

**Rixls6** · #7 03-14-2007, 02:32 AM

If you come up with a correct part number, let me know.

Thanks

**Mr70** · #8 03-14-2007, 06:53 AM

IF it's got an outside diameter of 6 & 1/2,it's power steering pulley #3878245 for all 1965-69 Corvettes w/396 & 427 CID....IF

**Rixls6** · #9 03-14-2007, 05:29 PM

Thanks for checking on that for me Rick.
I just measured the pulley. It's 6 & 1/8, so it must be a different part # than what you found.

**Mr70** · #10 03-14-2007, 06:50 PM

Rick..then I believe that's pulley #3834720.
Used on:
*1961-65 Passenger w/Spcl. Hi-Perf 348 & 409 CID.
*1965-68 Corvette Spcl. Hi-Perf 327 CID w/o AC.
*1969 Corvette w/Power Steering,but not 350 CID.

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