7 porters and high duration cams are notorious for producing a low manifold vacuum figures in mercury inches etc. However, some brake servo's are of course vacuum assisted.
Has anyone fitted an electronic vacuum unit to operate the servo?
Did you run it from an ignition or manual switch to a constant live?
Some electronic vacuums on the market seem to require If run from the ignition did it draw 10 to 15 amps, would this rob the ignition coil and effect engine performance if run from an ignition live?
Just after some ideas and thoughts thanks guys!!