I need help how many cfm
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I need help how many cfm

  1. #1
    Senior Member skippers WFOT's Avatar
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    Default I need help how many cfm

    here is the build up..... 69 396, .030 over, 10.25-1, heads are oval port from a 66 396, 2.30 intake ports. going to run a weiand 2x4 tunnel ram with a shitload of cam(probably about 560-600 of intake lift with 234-250 duration @50)..........im looking for a very radical idle profile and a power range from 3k up. but what carburation should i run? 2x 450 or 2x 600. I know it should be mechanical secondaries but do i run choke assymblies or not? if i choke should it be elec or man. i will have enough fuel pressure i bought a hooley blue. sorry for the noob questions but i havent built a hp engine since 92. i just want to try to get it all close to right the first time. so i am asking all you veterans help

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    2ea 650 double pumpers with no chokes

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    Senior Member EVILFORCE's Avatar
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    660's center squirts. No chokes.
    No Fool Like A Old Fool is there?

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    1977 Custom Sprint Jet wickedsanger's Avatar
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    Quote Originally Posted by wicked performance boats View Post
    2ea 650 double pumpers with no chokes
    x 2 :d
    Wickedsanger... Gettin it done with a Small Block!!!!

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    Senior Member skippers WFOT's Avatar
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    so who has a pair for sale... budget is limited and i can get a new pair of 450's for $400 , so if i cant find a deal ill have to do that for now

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    Default tunnel ram

    I have a complete oval port tunnel ram set up with 660 center squiters and a nice hilborn scoop with flame arresters and cheater nitrous set up. i will take 650.00 for it

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    Default tunnel ram

    here it is it doesnt have the nitrous set up in the picture
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  10. #8
    www.highflowdynamics.com LakesOnly's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    so who has a pair for sale... budget is limited and i can get a new pair of 450's for $400 , so if i cant find a deal ill have to do that for now
    I've provided a link to two freshly remanufactured 600 vac secondaries for $450, and two freshly remanufactured Quick Fuel Technology 650 Double-Pumpers for $785. Available through Stahle Carburetors, remanufactured to tolerances tighter than Holley themselves and a good price for what you get in return for your money. I've had a lot of good experiences with them and so have others that I've sent to him. I think he provides carburetors right along the lines of what you will need for your application. Tell him Paul Kane sent you. Click HERE and then go to page 2 for some of the carb deals I noted above.

    660's are really nice WOT drag race applicable carburetors--hell I run them myself on my jet boat--but if you are just cruising the lake they can swallow all your gasoline faster than you can say "660 center squirters." Herc had two 750 progressive secondary carbs on his identical boat and could run all day on his two 11-gallon tanks. I, on the other hand, can empty my two 11-gallon tanks in 20 minutes with my 660's if I tried.

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    Last edited by LakesOnly; 03-28-2010 at 07:03 PM.
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  11. #9
    No Sandbar To Far sanger rat's Avatar
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    Quote Originally Posted by wickedsanger View Post
    x 2 :d
    x3
    Quote Originally Posted by One More Year View Post
    The only blab's I will even be a part of is just when it is me they are talking about. Aaaah yes I can see a few good looking shiny tall deck motors on the beach, with barely enough fuel to get back to the launch saying, "Holy crap how fast you think that Daytona was going man? That's like the 20th time he's gone by today?"

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    Default tunnel ram

    I would go with 660s they run real good they may not get good gas milage but thats not something some of us worry about with hot rod boats, your not going to get good milage out of a big block.There are plenty of 660s forsale at a good price

  13. #11
    Senior Member skippers WFOT's Avatar
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    thanks for the help, i will contact the ebay guy tommarow

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    Senior Member TNYoungblood's Avatar
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    I've been wondering the same thing with my boat.. I have a 468, 642 Roller Cam 242 @ .050 Duration, 3964291 GM Heads with oversized Valves Pro Mod Porting and Polishing with about 13:1 comp.. Maybe 700 HP.. I am running 2 660 right now on a tunnel ram and they do good but I was thinkin about goin with 2 750 or even 850.. Any Ideas on this ?????

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    Senior Member BigBoyToys's Avatar
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    I always like to go big. Due to pump efficiency, Jet Boats will only use how much fuel that it needs (That's what I was told by a very well known Jet Boat Fella anyways ). SO you're not going to be over-carbureted. It is pretty easy to be under-carbureted though
    "That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government"
    Declaration of Independence, July 4, 1776

  16. #14
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    holley has a carb/cfm calculator on thier website here is the link below.

    http://www.holley.com/applications/C...bSelection.asp

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