Any body use 340 intake volume on a 572 10 to 1 compression motor ? My friend has a 19ft jetboat wants to run 5600 rpm needs cam advice,850 carb,cmi ex,I know big runners kill some low-end torque,any thoughts?

Just an opinion, that's not a big runner on a 572, a CNC ported head may be better.

that is also not enough carb for that combo

I was thinking more like a 1050 carb. I have done a couple of 496's and used 950's on them.

that is more what I was thinking. on my jet boat I ran a 750 DP on my 454 and it probably could have used bigger as it spent all its time at WOT. always felt like it ran out at the top but it was a cheap build and I didnt feel like swapping it.

Have you looked at the AFR 357 magnum or Brodix

I’ve got dart 335s on a 540 . 712 hp @5600 rpm 850 qft carb. Just for reference.

That's not that big a port on a 572. Should be looking at a 1150 or 1250 Dominator. It's gonna need a lot of cam too. Throw all the rules about building little engines out the window when you start building big boy toys.

Do you think 335 is too large for an NA 496? What volume would you recommend for a 572? 355+?

I ran Dart 345`s on a 540 .