I have an issue, but I don't know what's causing it. I think I either have a slight timing issue and maybe a carb issue. When I took the boat out yesterday, the highest I got the GPS to was 46 mph at a little over half throttle. When I try to give it more gas, it starts going pop, pop.......pop, pop, and the boat actually feels like it slows down a little bit every time it pops. The 46 was the first run I made, and everything after that I could only get it up to about 33 mph, then the popping would get worse. If I held my foot steady, it wouldn't pop, but if I tried to give it more gas, it would start popping. It's been doing this since the first day we put it in the water. I don't have a working tach (I think the tach is broken, we've wired it every way possible) so I have no idea what rpm I was running at. I'm "guessing" it's because we're setting the timing at idle (or with the engine off) instead of at RPM because we have no tach. But, I really have no clue. I checked the fuel/water seperator for water and there was only a tiny bit of water that came out, and the gas is all brand new 89 octane.
I'm going to check the float level in a few minutes, and I'll let you know what I find.
It is a BBC w/ a Mallory Unilite distributor (mechanical advance) and a Holley double pumper w/ mechanical secondaries (I think it's a 750).