a marine version? Is it just a standard holley tuned different or is there different parts. This queswtion started one hell of a debate last night and I thought some of you guru's would know the specifics.

The Main Diff Are The J Tubes

J tubes, throttle plate shaft seals and vacuum tube on same. Mostly it's the coast guard approval number stamped on them

Actually the USCG does not certify carburetors, they haven’t for years. A carburetor must be built to meet USCG requirements or guidelines. These guidelines explain what is to happen if a fuel pump has a pressure spike, or a N&S leaks so that fuel does not leak into the engine compartment. Basically the vent tubes, baseplates, and calibrations are different, plus the carburetor manufacture has to have documentation that they have done the appropriate testing to meet the criteria.

What does this mean to you?

Well, if you take a standard automotive carburetor and do all of the modifications yourself to “Marinize” it you won’t be legal if you get into trouble. Meaning if you have a problem, and your insurance company finds out they can drop you!