U/D pulley ?

[Jacob_Royer]

What U/D % would a 3" pulley be?

[acb92sc]

On A Early Model Blower, A 3" Is A 10% Overdrive Pulley For The Supercharger, Not Sure On A Late Model Blower.

[68COUGAR]

What U/D % would a 3" pulley be?
If you are talking about the ASP underdrives (p/n: ASP520425), then the Crank is 25%, & the water pump is 29%, and the alt. pulley is 3". ASP does not say what the percentage of underdirve is on the alternator. You could figure it out if you knew the stock pulley diameters (& therefore circumferences) AND the diameters (circumferences of the UD pulleys.

However, if you want to use the 3" alternator UD pulley w/o the UD crank pulley, then you have to refigure everything.

68COUGAR