1969 & Later GM Pulleys (Long Waterpump)

[blackoutsteve]

Water pump pulley 6" (technically 5 3/4") to suit 1969 & later SB & BB with (or without) AC #3995631 AO.

http://img291.imageshack.us/img291/8469/pulleysel3.th.jpg (http://img291.imageshack.us/my.php?image=pulleysel3.jpg) http://img291.imageshack.us/img291/3443/pulleys002by1.th.jpg (http://img291.imageshack.us/my.php?image=pulleys002by1.jpg)

Crank pulley 8" total diameter (techincally 7 3/4") to suit 1969 & later SB & BB with (or without) AC & PS #3972180 CE.
http://www.camaros.org/pdf/pulleys-PN-2007-02-01.pdf

http://img291.imageshack.us/img291/4870/pulleys004lp2.th.jpg (http://img291.imageshack.us/my.php?image=pulleys004lp2.jpg) http://img291.imageshack.us/img291/5010/pulleys007kn2.th.jpg (http://img291.imageshack.us/my.php?image=pulleys007kn2.jpg)

Interested?

[blackoutsteve]

Bumped for Jay.
Jay, the water pump pulley is 2" (an actual 1-15/16") overall height when laid flat.
I can measure back-space from inner pump flange to belt centerline if you want. :)

[jaywildone57]

Thanks Steve, will pick up from you next catch up.

[1956SedanDelivery]

Thanks Steve, will pick up from you next catch up.
A big block lower pulley is different to a small block pulley. A big block pulley wont fit a small block because the centre hole is bigger and it wont sit flush on the balancer.

[blackoutsteve]

Googling several (unofficial) sources say this pulley was used on both SB & BB. All long pump applications.
The flanged hole in the center of this crank pulley is only 1-1/8" diameter. I couldn't imagine SB balancers have a smaller hole given that their crank bolt washers are 1-3/4" in diameter. :)

[1956SedanDelivery]

Big Block definatley has a larger hole in the middle and that helps to centre the pulley as well, if you use a small block pulley on a big block it can be put a bit off when lined up only using the three bolts.
Just went and measured two pulleys the
Big Block long water pump three row pulley has a 2" hole in it.
Small Block pulley has 1 1/8 hole.

I think that a small block balancer retainer bolt retains the pulley as well where a big block goes between the pulley and the balancer.
If I get a chance tomorrow I will take a photo of both and post it.

[blackoutsteve]

Cool, thanks.. :)
For what it's worth, worked fine on my BBC for many years. The three pulley retaining bolts seemed to do a fine job in centralizing it as it was never eccentric.
Not optimum, but no problem.

[jaywildone57]

....ahhh thanks for clearing that up guys but I was after the top pulley :D

[1956SedanDelivery]

....ahhh thanks for clearing that up guys but I was after the top pulley :D

Thats cool but that still doesnt make the bottom pulley a BBC one.

---------- Post added at 07:46 PM ---------- Previous post was at 07:40 PM ----------

Steve you know what ,the small block one I measured is on my Big block and has been for 10 years or more. I was mainly saying a big block one wont fit a small block as the lip to centre it will not let the pulley seat properly. I am also on the look out for a pair of pulleys like Zoops or March for a short pump as we speak.
Its about time I changed to the correct pulleys.

[blackoutsteve]

The pulley that's on my BBC now is the correct L78 one according to the correct numbers and from memory, does have a larger inner hole that we're talking about.
Apart from that, it's identical to the one I have here, albiet an SBC one. :)
It was on the BBC in the Camaro when I bought it in 1992.

[Cogburn]

Do you still have the triple groove lower pulley? I need one for my AC installation.

[blackoutsteve]

Yeah, $50 posted if you want it. :)

[Cogburn]

Yeah, $50 posted if you want it. :)

Yes! I'll PM you.

[jaywildone57]

Thats cool but that still doesnt make the bottom pulley a BBC one.

---------- Post added at 07:46 PM ---------- Previous post was at 07:40 PM ----------

Steve you know what ,the small block one I measured is on my Big block and has been for 10 years or more. I was mainly saying a big block one wont fit a small block as the lip to centre it will not let the pulley seat properly. I am also on the look out for a pair of pulleys like Zoops or March for a short pump as we speak.
Its about time I changed to the correct pulleys.

Please dont include me in this discussion,
I really dont care, I only want the top pulley

[blackoutsteve]

It's yours SweetHeart. ;)