Flat 4 bolt crank pulley

I am having a hard time finding a flat single groove 4 bolt crank pulley. Anybody have any leads? Thanks

I guess Jones was no dice?
See if you can find one that is the correct OD, but wrong in the middle.
We can make one....

Looking like that's what it is going to be. FE 3 bolt and machine to 4 bolt I guess...

QtrWarrior wrote:I have taken a chevy 3 bolt pulley and re-drilled it in a 4 bolt pattern before..

Right center diameter?

QtrWarrior wrote:

soupbean wrote:

QtrWarrior wrote:I have taken a chevy 3 bolt pulley and re-drilled it in a 4 bolt pattern before..

Right center diameter?

Nope, had to bore it to size..

10/4. Thanks.

Wheelie58 wrote:I guess Jones was no dice?
See if you can find one that is the correct OD, but wrong in the middle.
We can make one....

This has to be a common need. I can't believe no one makes it. Might be a good addition to your product line.

soupbean wrote:

Wheelie58 wrote:I guess Jones was no dice?
See if you can find one that is the correct OD, but wrong in the middle.
We can make one....

This has to be a common need. I can't believe no one makes it. Might be a good addition to your product line.

Yeah....I have made a couple out of Chevy pulleys.
If it goes on the front of the crank trigger wheel, I make a little center register to snap in to the recessed hole in the wheel.

What about drilling out the spotwelds on a later model pulley & pulling the stack apart? Isn't the pulley on the back of the stack a flat one on some years?

can you post a pic of what you are looking for

bruno wrote:can you post a pic of what you are looking for

https://www.429-460.com/t13307p75-vacuum-pump#170971

Like Doug's where I posted on page 6. His was a custom made deal and he gave me contact info but it would be 4 weeks out. Trying to come up with something next week.

Doug Rahn's deal.

I emailed a pic to you...

Lem Evans wrote:


Doug Rahn's deal.

Yep. That one.

CV products , run pump drives and can drive a V belt .

For those that run into this, I had NO luck finding someone who stocks a flat 4 bolt BBF pulley. In the end I bought a flat BBC pulley and had the hub bored and holes drilled to the BBF 4 bolt pattern thanks to Keith Fulp of KFM Motorsports. I also used one of Keith's 1/4" crank pulley spacers to align with the location I mounted the alternator. This will also allow for future installation of a crank trigger wheel if I decide to do so...

I don't know . That pulley looks an awful lot like a KFM Flying Toilet restrictor plate to me.
Glad it fit...always happy to help.
Thanks
Keith

soupbean wrote:For those that run into this, I had NO luck finding someone who stocks a flat 4 bolt BBF pulley. In the end I bought a flat BBC pulley and had the hub bored and holes drilled to the BBF 4 bolt pattern thanks to Keith Fulp of KFM Motorsports. I also used one of Keith's 1/4" crank pulley spacers to align with the location I mounted the alternator. This will also allow for future installation of a crank trigger wheel if I decide to do so...

Not to be a pooper of parties, but I've been there and done that.

Used a chevy flat pully about 4.5" across, to a stock alternator pully. On the dyno run with the first hard pull to about 9000 RPM, the belts shot off and with the gimler belt driving the fuel pump, off, of course the engine shut down. Walked into the dyno room, and had this high pitched whinning sound, looking around, couldn't figure out for the life of me what the F was whinning, till I saw the alternator still spooling down.

With the multiplication of the larger crank pully and the small alternator pully as used on street oriented cars not intended to see above about 3500 RPM, we figure we got the old alternator up around 20,000 RPM.... don't think I'de ever need that much alternator output.

If your engine is going to see any RPM. id suggest at most, a pully ratio 1-1 but most likly want to get that crank pully way smaller, and that alternator pully way larger to start an RPM reduction.

So where did you end up buying that pulley from?

I ended up making one, put the spacer for the gimler drive right into the pully.

jasonf wrote:So where did you end up buying that pulley from?

$25 summit deal here