Originally Posted by Banks
This boat floored would reach 4000 rpm. Now it will barely reach 3600. I wanted to at least regain lost power. I would also, like suggestions on what I could do to get more power without dropping a ton of cash.
Eventually I want this to be a seventy 75 to 80 mph boat. Right now its only going about 50 mph. I know the headers need to be fixed, but can they take that much horse power out of the boat? I also just bought a 750cc holley.
You stated the you installed a new Mallory ingnition. I think you you need to check your ignition timing. Make sure the advance system is functioning. Then, I would suggest you start at about 32* BTDC @ 3000 (32 degrees before top dead center while the engine is turning 3000 rpm). It will be important to do spark plug readings and check air/fuel mixture, especially since you have a new carburetor. If color is good, bump up to 34* BTDC @ 3000 rpm. These settings assume 91 octane pump gas.
However, if the plug color shows that your air/fuel is already too lean, then you will need to increase fuel to the engine before you increase ignition timing.
The tubular headers are supposed to drip water. They have small holes on the underside of the individual tubes so that water does not settle there and rust the tubes after the engine is shut off and the boat is put away. They should help the engine generate a LOT more power.