We boat alot during the summer. But 100hrs for us in a year would be alot. Our boat will run 100 at 4300 rpm with our old power and they were 975 and we could turn them 6400.

Most of the time boating with the groups we boat in speed stay between 60 to 80 mph.

I couldn't agree more on going Coil Near Plug with IGN1A coils... there's a reason Mercury uses them on all their big engines. Since you're running Holley EFI - and their hall effect setup, it's second nature to eliminate the issues with distributors and the unreliable MSD boxes. You'll have way more control over timing as well (individual cylinder)! You're basically a perfect candidate and it wouldn't cost much more, if any, since you're most of the way down that path and wouldn't need ignition boxes.

Cool build!

We are going to have to hold off on the EFI for know. It's just way to much at this time and there is only one way to do it witch is 110%. We have opted to spend that money on the actual hard parts of the engines to make them nicer.We can all ways go back and put the EFI on them.

I am thinking you would be in the high 900s with that compression and a very good 4brl. Or more with 2-4s. I was able to get 960 at 6800 with the same inches IR intake. And it made 900HP at 5900rpm

I was really wanting to do efi but at this time it don t fit in the budget. So david ordered dominators from book/BRE Not really sure witch ones they mitr even be his billet ones. I have 4 new 4150 style 980cfm new in the box from DaVinci but we are trying to keep it simple. Lol any body needs them they are for sale.

What kind of valve diameter and valve lift are you guys running with the big NA stuff that goes to 6500+ rpm? I would think something in the 2.4 range at minimum, and prob around 1 inch of lift for a 665ci turning that rpm. A cam prob in the 280's/290's at .050?

Is there any reason to stick with a single 4 barrel on a build like this, vs twin 4 barrels?

Our deal is 2.40/1.80 and only around 800 lift. And no were near that duration.

Because those carbs are budget ? Hah ! :).

Better then 11k in efi lol