Manifold Vacuum Experiment

Demonracer said

RRR, have you put a vacuum gauge on the different ports to see what the Hg reading is from idle up to cruising RPM?

Click to expand...

Yup. It has about 14hg at cruise. It's not a vacuum miser, because of the camshaft. It's an old NOS Crane Fireball. .505/.515 228 and 232 @ .050 on a 108, so it's got some cam. Amazingly though, it operates power brakes surprisingly well.