what is the size of a underdrive pulley

[1320n10]

How much difference in size is a underdrive crank pulley than stock

 

[ChrisCairns]

Approximately 4.8" to the top of the lands. That's eyeballing my caliper on the outside to the top of the lands inside the hub.

Stock looks to be just over 6.25".

 

[1320n10]

Thanks chris Is this on your race car? And are all the other pulleys the stock size and do you have any charging or cooling problems

 

[ChrisCairns]

Originally posted by 1320n10
Thanks chris Is this on your race car? And are all the other pulleys the stock size and do you have any charging or cooling problems

Not on race car.

I've had it for some time, just sitting on the shelf and I was going to use it on a 109 engine I put together over the winter. Then I decided against it....for the reasons that you mentioned above as questions.....lol.

 

[Not Avg 6]

Never had any charging or cooling problem with my underdrive pulley. Actually have it for sale at a good price, because I went to a front mount and RJC's razor cut pulley set.