I just picked up another boat - 1981 with a small block Chevy engine and an OMC 800 outdrive.
The engine has a GM HEI distributor with the coil in cap - and a vacuum advance diaphragm that is hooked up to the 2 bbl carb with a rubber hose. I am assuming this is automotive and not original and should be removed. Am I right that none of the I/O car motors use a vacuum advance?

The engine has a GM HEI distributor with the coil in cap - and a vacuum advance diaphragm that is hooked up to the 2 bbl carb with a rubber hose. I am assuming this is automotive and not original and should be removed. Am I right that none of the I/O car motors use a vacuum advance?
