Carb selection?

[restofreak]

I'm putting together a 454 .30 over to put in my next project boat. 2X4 Tunnel ram, 1.7 roller rockers, pretty much stock heads, mild cam. Probably end up around 9.5:1. You guys think 2 600cfm carbs would be right for this motor?

[Sleeper CP]

Where is Hotboa, he should answer this:rolleyes:
Sleeper CP
Big Inch Ford Lover

[W.O.T]

i think that would be too much carb.

[centerhill condor]

i think that would be too much carb.
what he said...
CC

[GofastRacer]

Had basically the same setup before in a ski boat, a pair of 400 vacuum secondaries worked good!..

[ol guy]

600 cfm what? double pumpers or vac secondary. Properly jetted 660 center squirters will work great on a boat with easier flowing exhaust and a mild cam.I have done this and been very happy with the outcome. Motors not to fat and jets are easy to change. M

[justfloatn]

What type of boat? Jet boat? What will your max RPM be at.
I anly ask due to the tunnle ram and dual carbs. What type of stock heads?
70's, 80's? oval or rect.
If they are stock 990's on a jet or v-drive the dual 600cfm should be perfect.
anything else the 400cfm
I/O loose the tunnle ram

[restofreak]

Motor will be in a jet boat, max rpm of around 5500, stock oval port heads 70's vintage likely ..with log style through hulls( I know they are major horsepower robbers but I have them already and this build is for re-sale)....thinking of using the edelbrock performer 600's....maybe jet them down as small as they will go. Thanx for all the feedback guys.

[Wazoo]

Put them on there right out of the box. They will run fine. Myself, I would rather run a couple of Holley 600 vac. secondarys. Maybe even less $$$. I think the Holleys look better on a tunnel ram. Just my .02.

[W.O.T]

For that setup i would just run a single carb and good intake manifold.

[Jetaholic]

For that setup i would just run a single carb and good intake manifold.
I second that. I have pretty much a mildly cam'med 9.5:1 454 and am only running an Air Gap with a Holley 750DP and that's plenty for around 5300RPM. No need for the tunnel ram.

[justfloatn]

tunnel ram and oval port..bad combo:rolleyes:
I third the comments. Sell the tunnel ram and get a Preformer RPM oval and 750cfm to 800cfm carb. IMO an open plenum oval would be better suited to the instant RPM gain of a jet. Victor or Torker.
Even if you're trying to sell. The turn key performance will sell the boat. And you'll save a couple of bucks on trying to tune two 600's to run correctly on that motor set-up.