BBC454 Jetting Specs with Log and 800DP
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BBC454 Jetting Specs with Log and 800DP

  1. #1
    Senior Member SkyHarborCowboy's Avatar
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    Default BBC454 Jetting Specs with Log and 800DP

    I need some baseline jetting specs for a 325 HP with Performer Intake, Holley 800DP and Log exhaust. The engine runs good but it is way rich. I got the carb from a friends race car and for the life of me forgot to look at the jets after the rebuild. Anyway, if someone can give me ball park settings (primary and secondary jets, nozzles and power valve) I can take it from there. The float level is perfect so that isnt an issue.

    Joe
    Thanks,

    Joe
    1988 Commander BBC454 Berkley JE-A with A-Impeller

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    Senior Member SkyHarborCowboy's Avatar
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    I should add that I dont know the idle vacuum as I dont have a gauge but the rest of the motor other then the intake and carb are bone stock!

    Thanks,

    Joe
    Thanks,

    Joe
    1988 Commander BBC454 Berkley JE-A with A-Impeller

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    Start with the stock jet size and go from there. The stock jet size can be found at mortec.com using the list number.

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by hotrod56cars View Post
    Start with the stock jet size and go from there. The stock jet size can be found at mortec.com using the list number.
    X-2 But keep in mind that fat is safe! I would go 86 pri-88 sec and then play. If it is an old school 4781 then should be fine. Always remeber that plugs are cheaper than pistons. No offense hotrodM

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    Senior Member SkyHarborCowboy's Avatar
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    Mortec.com says:

    The list number is 4780 800CFM
    (F)72,(R)76 6.5,8.5 4150

    It doesnt mention what squirters are supposed to be there.

    Joe
    Last edited by SkyHarborCowboy; 01-06-2009 at 05:25 PM. Reason: Clarification
    Thanks,

    Joe
    1988 Commander BBC454 Berkley JE-A with A-Impeller

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    Senior Member DuaneHTP's Avatar
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    On that stock 325 hp motor, you might do yourself a favor by putting on a good 650 or 700 cfm and solve the problem.

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    NW Spectraholic Malcolm's Avatar
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    I'm running a 750HP on my stock Olds. It has 72/84 for jets. It runs up to around 4500 rpm on the primaries and in cold weather was popping a little bit. Then once the secondaries open it's really fat. I'm going to try going up in the front and down in the back. I was running an 800 with 76/82 in it with no problems but the plugs were black! I'm thinking of square jetting it 74-76, but I'm most likely running in much cooler temps than you are.
    Last edited by Malcolm; 01-06-2009 at 06:45 PM.
    Malcolm

    75 Spectra 18
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    Senior Member SkyHarborCowboy's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    On that stock 325 hp motor, you might do yourself a favor by putting on a good 650 or 700 cfm and solve the problem.
    Duane,

    There are no problems. I simply asked for some baseline jetting sizes to get me into the ball park jetting wise. The carb came off of a small block race car and I honestly either forgot the jets that arre in there and/or I never looked at them!

    Joe
    Thanks,

    Joe
    1988 Commander BBC454 Berkley JE-A with A-Impeller

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    On that stock 325 hp motor, you might do yourself a favor by putting on a good 650 or 700 cfm and solve the problem.
    My 700cfm'er was stock with 66 front, 76 rear, 6.5" front power valve, and was quite happy even after the intake manifold and cam were changed (was likely a tad fat to start with).

    Went up to 67/77 when the headers went on, the head porting it stayed the same, and is happy. 69/79 was too much.

    If only your 800 was a tad bigger, i'd consider offering a swap. LOL.

    Kinda looking 850 tho since I am cranking a lot more RPM on nitrous tho than i used to.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Start around 74 all the way around. Get a power valve block off plug square the jets up and rock out. In my personal opinion squirt boats and power valves are not the best combo. JMO

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    Quote Originally Posted by ol guy View Post
    ... No offense hotrodM
    None taken. The only reason I replied in the first place is because he wasn't getting much response, so I figured I'd put my .01 in and THEN he'd get some response!

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    Quote Originally Posted by SkyHarborCowboy View Post
    Mortec.com says:

    The list number is 4780 800CFM
    (F)72,(R)76 6.5,8.5 4150

    It doesnt mention what squirters are supposed to be there.

    Joe
    The 850 comes with 31 squirters, I believe. Fat is where it's at.

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    Senior Member swtd's Avatar
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    Correct I have 31 squirters in my 850 double pumpers. primary secondary jets BIG.

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    Senior Member SkyHarborCowboy's Avatar
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    LOL,

    I like how this goes, I specifically state I have an 800DP and half of you want to talk about the 850DP I dont have.

    Joe
    Thanks,

    Joe
    1988 Commander BBC454 Berkley JE-A with A-Impeller

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