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Thread: bbc ab impeller Q&A

  1. #1
    robsquezn
    have a 468 BBC ram 2 750 carbs had oval port heads & a solid cam 630 lift
    max rpm was 5000 now i have dart steel heads & a 690 lift cam solid roller
    any buddy know what the rpm change should be

  2. #2
    sanger rat
    Are you saying you only spun a AB to 5000?

  3. #3
    Squirtin Thunder
    Too much cam for that impeller.
    Too much carb for that impeller at that rpm !!

  4. #4
    sanger rat
    Let's get all the facts before you jump the gun Jim.

  5. #5
    robsquezn
    yes the old combo ran 80 mph at 4900 to 5000

  6. #6
    RCB19
    have a 468 BBC ram 2 750 carbs had oval port heads & a solid cam 630 lift
    max rpm was 5000 now i have dart steel heads & a 690 lift cam solid roller
    any buddy know what the rpm change should be
    You should be seeing more than 5K out of the oval setup for starts. What's the CR of the motor?

  7. #7
    robsquezn
    more details- 19 foot pioneer river racer 468 BBC edelbrock rec port tunnel ram with 2 750 edelbrock carbs 11.5 t1 comp isky z89 solid cam 630/630 304/264 @50 with 108 lc ran 4 deg adv..oval port heads with big valves
    berc jg pump with A/B impeller
    loder grate
    shoe
    ride plate
    3.025 nozzle
    & a droop snoot
    ran 78.6 to 80.5 all day long
    now im going to a set off box stock rec port dart 320s with 2.300 / 1.88 valves $ a solid roller cam 695/661 lift 278/279 @50 109 lc

  8. #8
    YeLLowBoaT
    1500 cfm is ALOT of air.... a 468 ci with 100% VE @5k rpms is only going to use 677.08 CFM thats barly over a 3rd of what his carbs are puting out.

  9. #9
    robsquezn
    the boat ran real good last year i have yet to be beaten out off the gate
    it ran real hard to the 1/8th but seemed to even out on the top end

  10. #10
    malcolm
    Yeah, that doesn't sound right... Sure that's not another A instead of that B?

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