recommendations for carb BBF 502...
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recommendations for carb BBF 502...

  1. #1
    Junior Member HydroHaulic's Avatar
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    Default recommendations for carb BBF 502...

    past summer i picked up a nice jet. still having challenges with what seems like lack of fuel and air on top end.

    from what i understand:
    BBF bored to 502, performance cam, solid lifters, roller rockers... MSD ignition and Mallory dizzy

    carb: Holley Model 4011 800CFM Marine (been cleaned and re-new kit)

    seems not many like this carb... ready to try another...

    Please post your recommendations and I need to keep a fair budget. (no electronic) vacuum secondary?

    thank you in advance!

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  3. #2
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    Check float level..what is your timing at?

  4. #3
    Junior Member HydroHaulic's Avatar
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    mallory set at about 14-15 deg idle... i understand to throw 18 deg to about 32-33 deg at speed...

    have also varied lower and higher with similar response

    valves... not exactly sure what they are but set lash per a hopeful similar Crane street cam.. also varied with smilar response.

    carb has been throughly cleaned 2x ... floats, seals and pumps replaced in renew kit.. float height set numerous times.. switched to elec holly blue pump with reg set at 7 psi..

    thanks for any help! much appreciated...

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  6. #4
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    from your post i am guessing that upper rpm performance is poor,the afr may be wrong or you,r valve springs might be week.

  7. #5
    Senior Member ol guy's Avatar
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    Quote Originally Posted by HydroHaulic View Post
    past summer i picked up a nice jet. still having challenges with what seems like lack of fuel and air on top end.

    from what i understand:
    BBF bored to 502, performance cam, solid lifters, roller rockers... MSD ignition and Mallory dizzy

    carb: Holley Model 4011 800CFM Marine (been cleaned and re-new kit)

    seems not many like this carb... ready to try another...

    Please post your recommendations and I need to keep a fair budget. (no electronic) vacuum secondary?

    thank you in advance!
    check fuel pressure AT CARB first.

  8. #6
    Senior Member bville's Avatar
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    Quote Originally Posted by HydroHaulic View Post
    past summer i picked up a nice jet. still having challenges with what seems like lack of fuel and air on top end.

    from what i understand:
    BBF bored to 502, performance cam, solid lifters, roller rockers... MSD ignition and Mallory dizzy

    carb: Holley Model 4011 800CFM Marine (been cleaned and re-new kit)

    seems not many like this carb... ready to try another...

    Please post your recommendations and I need to keep a fair budget. (no electronic) vacuum secondary?

    thank you in advance!
    What kind of manifold do you have?and really BBF bored to 502 how sure are you about what you really have?
    Last edited by bville; 07-05-2017 at 05:50 PM.

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