Midcarolina does have a valid point. A lot of times guys swap out carburetors then swear up and down it gave them way more power, better holeshot, better top speed, made wife's boobs bigger, etc. I would then submit that the original carb was fubar. However he states it is actually ok except for minor acceleration problem. A carburetor all by itself of the same or larger cfm won't necessarily give you more power. It may get you crisp acceleration better mid range performance simply because it's new and you're used to an older carb that has deteriorated over time and now you have original performance. As for top end if the engine can actually use the extra cfm available it may give you a mile an hour or two of top speed. A 600 cfm carb is nearly double what a 5.7 at 5000 rpm actually uses. Simply adding a larger carb will not automatically make it faster. It may actually drop acceleration performance if you go to a carb with larger primaries. If going to a bigger carb and a performance manifold were so magical they'd come from the factory that way or offer it as an option. While you may increase HP a little, maybe 25 hp it wont make any difference on a boat because of the load the engine is under anyway. Automotive improvements don't apply to boats for the most part. Any one who says major performance increase with a manifold and carburetor is either: Had a poorly performing engine to begin with, Or has a very small and light boat with a 5.7, Or is talking out his rear end, Or is mistaking his car for a boat. Not trying to flame anyone and if he claims better performance well we aren't on the boat and he knows his boat. I'm just offering information and a little humor.
