['ol Pinion head]

Yes, Pontiac pulleys are of a different stagger than Chevrolet pulleys.

"351" casting is the '69 11 bolt short waterpump. With an AC diam crank pulley, will need an '061 or '062 AC diam water pump pulley, can ck the pulley racks, & see what I have.

An '060 wp pulley will not work, as it's the non AC (8" diam) wp pulley for '69 (short) 11 bolt water pumps. A '128 wp pulley will not work, unless you convert to a later TALL 11 bolt water pump.

[Scott Thelander]

cool
crank and power steering match up as buddies

why not spend 50 and get the correct pulley ?

I have a spare 9788886 68 ac w pump pulley that will work just fine

[Hikin Mike]

Originally Posted by 'ol Pinion head

Yes, Pontiac pulleys are of a different stagger than Chevrolet pulleys.

"351" casting is the '69 11 bolt short waterpump. With an AC diam crank pulley, will need an '061 or '062 AC diam water pump pulley, can ck the pulley racks, & see what I have.

If you have one laying around I wouldn't mind buying it.

[Hikin Mike]

Originally Posted by Scott Thelander

I have a spare 9788886 68 ac w pump pulley that will work just fine

The diameter of my current pulley is 6-5/8". Looks like the 9788886 is 5-11/16". Not sure I want to go that small. That would make the water flow faster. I would think a slower flowing would be better for cooling?

['ol Pinion head]

the '886 is a 68 AC application wp pulley, & will work on '67's.
Will ck the pulley racks when get home.

[Scott Thelander]

yah the 9788886 is a 67 68 number as mentioned
but
it works fine for a short pump 69 as the crank and power steering
crank and p/s pulley part numbers remain the same.. on the ac pulley set ups...
last summer we put a 6061 on a buddys 67 bird ac car engine as I
didnt have any 8886 at the time ,,, seemed fine ...
fairly sure the 8886 is same diameter as the 1040 as is the 6061 all 6.5"
pontiac used that same diameter pulley thru 67 - 76? on ac cars
musta worked well or Im sure they would have changed it up ..?

Ole pinion probably has a 69 6061 I have 2 now but no spares they have homes
just a box full of 1040 's that are no good to me in being into 68 n 69's.. imagine that ?? a spare 481040
and 2 8886 spare ac 67-9 short pump pulleys

glad you fingered it out

zoom zooooom

oh and ask Ole Pinion if he has a 69 only front alternator strap and a 67-9 rear for you ....
and a thermostat stud and get rid of that 68 strap ?

[Hikin Mike]

Originally Posted by Scott Thelander

yah the 9788886 is a 67 68 number as mentioned
but
it works fine for a short pump 69 as the crank and power steering
crank and p/s pulley part numbers remain the same.. on the ac pulley set ups...
last summer we put a 6061 on a buddys 67 bird ac car engine as I
didnt have any 8886 at the time ,,, seemed fine ...
fairly sure the 8886 is same diameter as the 1040 as is the 6061 all 6.5"
pontiac used that same diameter pulley thru 67 - 76? on ac cars
musta worked well or Im sure they would have changed it up ..?

Ole pinion probably has a 69 6061 I have 2 now but no spares they have homes
just a box full of 1040 's that are no good to me in being into 68 n 69's.. imagine that ?? a spare 481040
and 2 8886 spare ac 67-9 short pump pulleys

glad you fingered it out

zoom zooooom

oh and ask Ole Pinion if he has a 69 only front alternator strap and a 67-9 rear for you ....
and a thermostat stud and get rid of that 68 strap ?

Well, if those two pulleys are the same diameter, then I could buy that one if ole pinion doesn't have one. Guess I should get the correct alternator straps too, just because. Car is not a restoration. The only original part of the car is it's color.

['ol Pinion head]

The '886 wp pulley while being right under 6" diam, a somewhat similar diameter to the 6 1/4 diameter '061, the problem is neither are the same stagger; their grooves do not line up. When one takes a '886 wp pulley & sets it on its face, next to a '061 or even an '060 (8" diameter) set on it's face, there is between 3/16" & 1/4" difference in the stagger. I just took an '886, an '060, & both a '127 & a '130 & set them all on their faces. the 3/16"-1/4" difference was easily noticed between the '67/68 wp pulley & the '69 ('060) as was the 1/2" difference between the '060 & the two '70 model dual groove pulleys; the '127 & the '130.

Mike's solution is either a '69 short 11bolt pump designated '061 (6 1/4" diam AC appl pulley) or '062 (7 3/16" diam) pulley. Both of these were used on '69 models with the short hub '351 casting water pump.

OR

swap to a tall 11 bolt wp just like Pontiac dealership service depts were advised to do through Service Bulletins, when dealing with '69 models with their short hub 11 bolt pumps leaking, I.E, install the '70 & later "Tall" 11 bolt water pump and use the correct diameter '70 model V8 wp pulley. In Mike's case, that would be either a '128 or a '130 '70 wp pulley. This was exactly the service procedure dealerships used as Pontiac did not continue to cast the '351 casting (short) 11 bolt water pumps after June of '69.

my experience, this Pontiac recommended Service substitution worked fine except on '69 V8 Firebirds with a 5 blade flex fan & 4 core radiator. That particular application flex fan used a very short fan spacer & when one swapped to the 1/2" longer hub '70 waterpump, the 5 blade fan & spacer was thrust that much further into the relatively narrow fan shroud opening.

Cked pallet rack section of pulleys & unfortunately, I'm temporarily out of the '69 '061 & 062 AC application wp pulleys. Did not ck the 428HO out of my mothballed '69 GP project, am not sure if still has its short hub wp & original '69 AC pulley or if it received the Service procedure replacement pump & 70 pulley, will ck tomorrow!

[Scott Thelander]

wont the non ac big 6062 hit his big 0842 ac crank pulley ?? or be within a punt hair ?

I have been reading a ruler longer than I have been workin on pontiacs ruler 8 years old first bird house with dad,
and Pontiacs 20 years old 1980

and my 8886 's must be somethin off the wall because they are both 6 3/8 + diameter
real close to the 1040

Im steppin aside ... puttin LOWES on my list for a new tape measure

6061 pulley and some 69 brackets your golden

L 8 R

[Hikin Mike]

I'm okay with switching to the taller water pump. I don't use a flex fan, just the original clutch fan. I will need the '128' or '130' pulley then, correct?

[Greg Reid]

I just went through the pulley forest myself just a few months ago. I had been running the wrong wp pulley for years and did not know it. I always knew that the alignment looked slightly off. The biggest lesson I learned was to pick the stock pulley for your particular wp and make sure that the ps and crank pulleys are the ones that matched up with that pulley from the factory. There is a section in the shop manual that will show you the part numbers of all of the pulley 'sets'.