Last part to buy for my build is the carb. Ive read all the carb threads I can but am still stumped. Its between a holley 650 or 750. This jetboat acts like a giant dyno at all times. It spends basically no time below 3000 rpms. It will only run in temperatures between 100-130 degrees and the engine temp doesn't normally get above 150. I need a carb for this gen iv 5.3 with no mods yet. It wont get mods until this time next year.

 

You running it WOT the whole time?

 

Not all the time but wot will be around 5500 hopefully. It doesn't use a tranny so cruising is about 3-3200 r's

 

With a 5500 max, I would say the 650.

 

Well thats just an estimate, havent ran it in the boat so i'm just guessing based off the old small block

 

I would use a 650 with down leg boosters.

 

A 650 would be nominal i believe.

 

thanks guys

 

Dido on what everyone else said, 650. We just got in a few new sample 650 mainbodies if you are interested in some info on them shoot me a pm.