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Thread: Engine Tech

  1. #1

    Engine Tech

    Say fellow gear heads i have a problem with my BBC. Rebuilt the 750 holley and the distributor back and forth with plugs, R44, #5, i cannot get past 5400RPM without the engine acting like it has a rev limiter on it. Took it to a mechanic friend and he seems to think it is valve spring failure.
    What do you think? Motor specs below.
    396 + .030=402cid
    540 lift hydraulic cam
    10 to 1 compression (.250 dome pistons)
    Edelbrock Aluminum Heads
    Performer RPM RECT.PORT
    EdelbrockAir Gap Intake
    Mucie 4 speed

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    496
    ARE THE SPRINGS NEW,SOUNDS LIKE YOU MIGHT BE TO LEAN,TRY SOME BIGGER JETS IN THE CARB.

  3. #3
    Senior Member EXPERT BUILDER
    Join Date
    Mar 2007
    Location
    Michigan
    Posts
    379
    is this something new ? Did it rev up befor ? Is your distributor locked out ?
    Blowninjected 540 - when is going fast, Fast enough ?????

    http://www.racingjunk.com/profile/182079

  4. #4
    Member CRAFTSMAN
    Join Date
    Dec 2010
    Location
    anchorage alaska
    Posts
    56
    i had the same issues with the valve springs on my edelbrock heads. i would go to a better spring.
    This wouldn't have happened if only you had been paying attention!

  5. #5
    Senior Member RACING JUNKIE TheRabbit's Avatar
    Join Date
    Jan 2007
    Location
    Augusta, Ga.
    Posts
    2,295
    Is it a 4 - 7 swap cam? ( I'm not sure if hyd cam 4-7 swaps are avail ops

    This may sound stupid, but do you have a chip or some other kind of rev limiter on it? Chips do go bad. If you do have a chip change it or if it's a dial make sure it is well above 5,400. I run my limiter at 8,500 eventhough I only turn 7,800 to 8,000.

    It also could be in the distributor. Are you sure the rotor is phased correctly and it's not cross firing?


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