Pulley diameters - anyone have these pulleys

[KurtS]

Can you help with this pulley list?
Here is a list of first gen pulleys that we don't have the diameter (list is also on-site). The alternator pulleys don't always have numbers stamped on them so it would have to come from an known original part.
Diameter is simply the OD of the part. (Originally, they would have been measured over steel balls because you care where the belt sits, not the OD.)  Sorry about the column alignment, took work to even get it this nice!
SB is small block, BB is big block, DG is deep groove.

Pulley #   Application     Notes        Year
1969433   Alternator     L6, K76     68
3744043   Crank           SB             67, 68
3755820   Crank           SB     67
3770245   Water pump   DG, Z/28   67, 68
3790337   Crank ext for ps   L6     69
3844100   Alternator      DG, BB   67
3850156   Alternator      L6, 3843346 fan used   67
3853104   Crank ext for ps   L6 with A/C   67
3853400   Crank ext for ps   230 cu in   67
3860457   Power steering         67, 68
3863108   Crank           BB, DG, cast iron   67
3869978   Crank           DG, cast iron   67, 68
3871253   Alternator     L6, cast iron, 3843346 fan used   67
3874412   Crank           BB     67
3874416   Crank ext for ps   BB     67
3876846   Water pump         68
3876872   Crank ext for ps   L6     67, 68, 69
3880886   Power steering    L6     68, 69
3890419   Water pump        67, 68
3909815   Alternator      Fan and pulley are one piece   67
3909817   Alternator                67
3916385   Crank ext for ps   DG, Z/28   67, 68
3921923   Crank           DG, BB   68
3927789   Water pump  L6 with A/C   69
3932498   Crank           w/ PS, unverified usage   69
3937788   Crank           BB, unverified usage   69
3941105   Power steering   DG     69
3947824   Water pump  DG, BB   69
3955290   Crank           BB     69
3955291   Crank           DG, BB   69
3956664   Crank                69

Thanks!
Kurt

[HawkX66]

I have a couple of those BB 69 pulleys on my original 396 Kurt. I'll try to grab some measurements for you tonight. My water pump pulley isn't on your list though. Do you want that? 3932402 UD

Water Pump


Crank Pulley
3955290 AD

[jdv69z]

Do you want them measured with a tape, or with a calipers? So with a tape it might look like 6 3/4", but it might measure 6.80" with a calipers.

[KurtS]

Calipers would be preferred and more accurate, but tape is fine. 
Most pulleys already have a diameter noted - http://www.camaros.org/engine.shtml#PulleySpreadsheet. Just trying to complete the table.

Thanks!

[stovebolt]

1969433. I bought this NOS pulley for my 1968 L6 Sport Coupe. There are no markings on the pulley. The O.D. is 2.25".

[1968RSZ28]

3770245 Water pump DG, Z/28  67, 68 ≈ 7.1 (≈ 7-3/32" with tape measure) code CC

3916385 Crank ext for ps DG, Z/28  67, 68 ≈ 6.7 (≈ 6-11/16" with tape measure) code CD

Paul

[KurtS]

Stovebolt,
That's one that I didn't think we would ever get the dimensions!

Paul & Stove,
Thanks!

[jdv69z]

I've measured my 69 Z power steering pulley at 5.75" I can't verify it's the part number you listed, but it should be. I've attached a pic. Does it look like the correct one?

[KurtS]

Thanks, it looks correct.

[rich69rs]

3956664                   69
 1969 SB Base V8; CF code
6-3/4" OD, by tape

[rich69rs]

3956664            69
 1969 SB Base V8; CF code
6-3/4" OD, by tape

[KurtS]

Slowly knocking them off the list. Thanks!

[Marty]

I have several on the list but no time to get to them right now. I might have notes on some too. Will post when I have time.

Martin

[HawkX66]

Crank Pulley
3955290 AD

6.75" measuring tape

[plumL78]

3844100 alternator pulley is 3.218

[KurtS]

Thanks guys! 7 down!

[plumL78]

3863108  BB cast crank  67  is 6.735 or just .015 short of 6 3/4

[plumL78]

3869978 triple groove cast pulley in the same as the 108  cast pulley   6.735 or  .015  short of 6 3/4

[jdv69z]

Still need this one?  3947824   Water pump  DG, BB   69

I've got one on my car, but I don't know how to measure it with everything in the way?

[KurtS]

Thanks Kerry!

Jimmy, easiest for someone with the pulley to measure one. Measuring the circumference and dividing by pi has some error.

[1968RSZ28]

3876846 Water pump 68 ≈ 6.1 (≈ 6-1/8" with tape measure) code DJ

Note - I didn't measure this pulley myself. I gave this pulley to a friend a few months ago and he measured it for CRG.

Paul

[ko-lek-tor]

3863108 6 11/16 in
3874412 6 11/16 in
3874416 6 3/4in
3947824 5 7/8in
3955291 6 11/16in

Paul I get 6 3/16in on 3876846 DJ

[1968RSZ28]

3876846 Water pump 68 ≈ 6.1 (≈ 6-1/8" with tape measure) code DJ

Note - I didn't measure this pulley myself. I gave this pulley to a friend a few months ago and he measured it for CRG.

Paul I get 6 3/16in on 3876846 DJ

Hi Bentley - I'd go with your measurement (+ 1/16"). As per my note above, I didn't measure the pulley myself so I can't guarantee accuracy.

Paul

[jdv69z]

Looks like somebody's got it covered.

[plumL78]

Happy to help Kurt

[rare396bronze]

3921923  about 2 lines past 6 3/4. Hope the helps. About the only pi I know is apple or cherry pie!

[KurtS]

Here is the updated 'missing' list:

Pulley #   Application     Notes        Year
3744043   Crank           SB             67, 68
3755820   Crank           SB     67
3790337   Crank ext for ps   L6     69
3850156   Alternator      L6, 3843346 fan used   67
3853104   Crank ext for ps   L6 with A/C   67
3853400   Crank ext for ps   230 cu in   67
3860457   Power steering         67, 68
3871253   Alternator     L6, cast iron, 3843346 fan used   67
3876872   Crank ext for ps   L6     67, 68, 69
3880886   Power steering    L6     68, 69
3890419   Water pump        67, 68
3909815   Alternator      Fan and pulley are one piece   67
3909817   Alternator                67
3927789   Water pump  L6 with A/C   69
3932498   Crank           w/ PS, unverified usage   69
3937788   Crank           BB, unverified usage   69

Thanks!
Kurt

[Marty]

3744043 and 3755820 are both 6 3/4"

I think the stamped steel PS pulleys are all the same diameter.

Martin

[HawkX66]

Here is the updated 'missing' list:

Pulley #   Application     Notes        Year
3744043   Crank           SB             67, 68
3755820   Crank           SB     67
3790337   Crank ext for ps   L6     69
3850156   Alternator      L6, 3843346 fan used   67
3853104   Crank ext for ps   L6 with A/C   67
3853400   Crank ext for ps   230 cu in   67
3860457   Power steering         67, 68
3871253   Alternator     L6, cast iron, 3843346 fan used   67
3876872   Crank ext for ps   L6     67, 68, 69
3880886   Power steering    L6     68, 69
3890419   Water pump        67, 68
3909815   Alternator      Fan and pulley are one piece   67
3909817   Alternator                67
3927789   Water pump  L6 with A/C   69
3932498   Crank           w/ PS, unverified usage   69
3937788   Crank           BB, unverified usage   69

Thanks!
Kurt

You're missing the one I posted for 290.

[rich69rs]

The list of "the missing" is definitely getting shorter!

[KurtS]

Thanks Martin. Yes, many of the pulleys are the same size.

You're missing the one I posted for 290.

You're missing what that list is of - the missing ones!

[rare396bronze]

3890419 2 lines over 6 1/4. 3860457 one line under 5 3/4.

[ko-lek-tor]

3890419 2 lines over 6 1/4. 3860457 one line under 5 3/4.

By any chance do you know what scale you used to measure? How many lines are between each inch mark?
So that it can further be pinpointed as to what "1line under...2lines over" can be determined, please?

[rare396bronze]

If I measure with my Stanley tape measurer. If I say 3860457 it the one line before  5 3/4 I mean the next line mark before 5 3/4.

[rare396bronze]

There is 8 line's to each 1/4. So that means 32 lines.

[KurtS]

Yikes, take it down a notch guys. That was not necessary Bentley.

It's no problem, it's either 1/32 or 1/16. Sounds like 1/32 , so about 6.3 and 5.7.
Thanks!

[69Z28-RS]

3890419 2 lines over 6 1/4. 3860457 one line under 5 3/4.

3890419 -  6-5/16"         3860457  -  5-23/32"

[ko-lek-tor]

Yikes, take it down a notch guys. That was not necessary Bentley.

Apologies. A little humor mixed with a splash of sarcasm and a heaping of frustration when I can't be understood. I was outta line and sincere apologies to members affected. I did learn a lot about humorous measurements though.