hellas85stang

my stang hasa older block in it done up..after i put after market heads on it it ran rough and shaked baaaaaad////i put a vacum gauge to intake to see if a leak... needle shaked back n forth between 15-20 fast....i checked for leakes adn wasnt any..i pulled valve covers off and most of my roller rockers were loose bad////retightened and runs pewrfect....just thought if ya wanted to know a lil info on how to read a vacum gauge...not allway a vacum leeak....my valves wernt opening and closing right

vristang

There are some charts out there that help interpret the readings from a vac gauge.

I will see if I can find one when I get home.

tinman

Charts are in some of the older 'MOTOR"S repair books......