What is the distance across the pulley from bolt to bolt. I am trying to see if they will fit on the GM hub since they are both 4 bolt designs. The GM distance is 2.25" from the outside edges of each bolt head. Any help is much appreciated.

An even better alternative would be anyone in MD with the system that wanted to meet up and try to just swap the pullies one day.

 

Straight across measurement, to outside edge of each head is 1 3/4".

Diagonal measurement, outside edge of each head is 2 5/16".

 

Very cool. Thanks. I probably meant what you measued as diagonal as my straight across. No matter what you call it, it is the longer of the 2 distances.

The two hubs may be similar enough that the pullies are interchangable. If i can't find someone with the hub around here i may order a pulley just to test it...

 

I was thinking the same. Was gonna purchase just a 2.8 Non-Slip from SFPH and if it won't match i'm sure I could sell it. From outside edge (inside lip) i measured 2 3/8 inches and from outside to outside i measure 2 5/16 inches

 

Ok then we may be in business if you measure the GM at 2 5/16. My 2.25 estimate was on the car at a weird angle for me to get a precise measurement. That was my exact plan with the 2.8.

 

Yea mine is not on the car at the moment so I was able to get an almost exact measurement. I'm ordering the 2.8 right now. If it doesn't work then I will sell it

 

please update when you guys get news

 

Yeah this could show A LOT of potential.

-Rich

 

Well my order of my NGK BRK7E spark plus and 2.8 SFPH pulley shipped out today and will be here in 2-3 business days. I will update once I get it to let everyone know if it does or does not work with the GM hub

 

Beat me to it. I can't wait to hear what you have to say since i really don't have the money for the pulley now anyway. This could be a very nice upgrade in the future.

 

I'll be sure to let u know. You'll be the first

 

Someone else has tricky ideas other than me. I like it. Keep us posted!

 

Well I bought the 2.80" Pulley ring from SFPH and it does not fit onto the GM Hub. The GM Hub is too big. The bolt pattern is slightly off and the size of the holes are smaller on the SFPH ring than they are on the GM ring. SOOO. There goes that idea!!

 

Well that blows. Thanks for trying man.

 

Thanks for trying. I guess the blower is going to have to come off again. Damn it!

 

I'm sure SFPH and ZZP will hook us up in due time, but I haven't even gotten to drive my stage 2 with the 3" yet and I'm already craving a 2.8"...