VACUUM TEST
"Rule of Thumb"
Put thumb on vacuum hose leading to direct engine vacuum.
Don't feel anything Change thumbs and re-test
Still don't feel anything Vacuum is very low to none.
Hose has slight suction 1" to 5"
Suction causes skin to wrinkle 5" to 8"
Suction turns thumb blue 8" to 10"
Suction creates hickey on thumb 10" to 12"
Suction creates pain 18" to 20"
Suction will not r
