Wouldn't it be a lot of work to change a JF to a JC or JG? Because the transom of the boat is built for that style pump only, and there is a big fiberglass insert molded into the boat, fot that pump.
Yeah, pretty much a nightmare, those pumps use a hull insert that requires a whole bunch of fiberglass work to reverse, IMO not worth the effort.
These pumps aren't that bad, most of the time the little boots fail which is what causes the leaks, not to hard to replace and not that expensive, just remember to get some quality hose clamps (I always use the all stainless hose clamps made for silicon hose, they have a smooth band inside and don't cut the boots).
They built a lot of stuff into these pumps and the linkages are a little Hokey, but work fine, one of my freind has a 1980 21' Saber Jet with a 460 and the only mods are a 428 timing lower gear (Ford guys should know why) and a different carb and manifold (Team "G" Stealth and an 850 Double pumper) which we bought at a swap meet, and installed a super simple "stuffer plate", this 21' daycruiser does 65 MPH at I think 5000 RPM, if it turns faster, not by much, and thats through log style exhaust and through transoms, we did change out the ugly aluminum tips and put on the stainless ones with the two piece flapper inside (nice upgrade).
