Dizzy has marine tag too. What's the dizzy difference.

They incorporate a spark arrestor rating not unlike the starter motor, the screw down caps eliminate the "clips" and if ventilated, they use a spark arrestor in there too...Not much else different to speak of. (other than the mentioned SAE tag). 

GT

I have that carb on my 514 ford n its not enough. I am by no means a motor guru but I have pretty well determined the carb is to small. Its for sale too!!

Long story short at about 4800 rpm it falls flat on its face. I am gonna try a QF 1050. I got a trick flow intake so i wanna stay 4150 carb.

A little more information is needed for you guys. When I bought the boat two months ago, it had a Mr. Gasket fuel pump, which I swapped out immediately. Also it had clogged fuel filters which were replaced with Wix fuel Filters. Also, I used 3/8 inch fuel line as replacement hose. Are you saying the 3/8 line is too small of a diameter?



What size Dominator?

#8 or #10 hose will work good for your application. Depending on how many valves, reducers, fittings you have on your lines, it will restrict flow. I had 3/8" fittings with plenty of fittings and it restricted it a lot.

Not to be a dick, but do you know you have a 540? Other than what the previous owner told you. Any motor builder would know that a 750 is obviously the wrong carb for a 540.

I would definately change the fuel lines and filter. Earlier in the year, I changed my carb and lines. It made a huge difference.

Other than what the PO told me, I have no idea if it's a 540 or not. So unless I tear the motor down and see what is in it, I have to go on his word. BTW< I cannot for the life of me, get a hold of him either. Seems like he dropped off the planet.

Anyway, yes I have replaced the fuel lines from the tank to the carb as well as new Wix fuel filters.