6-71 small block build.

MiradaMegaCab said
I’d run the 8mm
43t bottom
52t top
That’s 17% under driven
Boost will be around 7PSI
The crank centerline to the snouts centerline will be around 20”

A 14408M75 belt might work, but you have plenty of time to figure that out.

Thank you that just the info I need.

Do you have a chart or something, how are you figuring out the pulley to boost numbers?

What would the boost be if I switch those pulleys to small pulley on top?

Thanks again!