[Stan Weiss]

Originally Posted by steve25

Hook up a vacuum gauge that you can read during a run to the motor.

If then on a run you see 3/4" hg or higher showing up within 500 rpm of your shift point then that's telling you your 850 is too small.

Gach,

Did you even read this post (I snipped it down)? You do know that Pontiac actually installed vacuum gauge in some of their cars.

Stan