Originally Posted by 68NovaSS
That's a cogged belt, won't slip. You sure you're not making boost at lower rpm's? Driving down the freeway at steady rpm's you're not going to be into boost anyway, as you said, boost comes in under load. If you hammer it from idle you're going to have boost if the blower is spinning! It's not an old blower with rotor to case clearances out of spec is it?
it is an older blower, but it doesnt really have that many miles on it. It definately doesnt show any boost right away when there is load on the motor.