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Thread: BBC 540 timing

  1. #1
    Junior Member APPRENTICE
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    BBC 540 timing

    Hello to all , I have a 540 bbc in a 67 camaro that will be used for street and strip, The car is all steel with inner fender wellsand a glass hoodcar is tubbed with a 4 link dana60 with 4;10 gearing ,31x 16.5 tire. the engine is 9;6.1 comp . heads are brodix bb-2 plus ported and flowed at .700lift 377 on int. 276 on exh. intake is brodix hv2000 with a quickfuel 950 p series carb. cam is a solid roller isky 276@050 ,.313 dur., .730 lift .110 centerline cam is degreed in at 106.375 of a degree.with.097 '' valve to piston clearance ignition is msd 6-al ,distibutor msd mech it is locked out and timing is at 34 degrees. trans is 400 turbo manual coan 3800 stall custom race convetorevry thing is brand new just got the car together.What is the best way to find the right amont of timing for this engine combo? thankyou for your time

  2. #2
    Senior Member RACING JUNKIE
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    The best way is to tune it on a dyno. The poor man's way is to take it to the track and find the spot it works best at.


    I have a 13 to 1 540 with -2x heads and I run mine at 38 deg locked. It's Never been onn a dyno just where it seems to run good.

  3. #3
    Senior Member MASTER BUILDER
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    I was just down at the local dyno asking the same question for my 496, I'm on a budjet and cant afford a day on the dyno, so the owner and I looked over all of his bbc dyno sheets. most made best power at 38. What was interesting was the difference from 35-38 on most 700hp big blocks was only 2-4 hp. I've locked mine at 36.

    cam67152

  4. #4
    Senior Member RACING JUNKIE
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    I think chamber shape and piston dome (or lack of) have a lot to do with it.

  5. #5
    Senior Member EXPERT BUILDER
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    id say lock it at 36 also....more cylinder pressure less timing no matter if turbo,nitrous,supercharged or na


    also, at the track getting the best mph is truest way

  6. #6
    Senior Member DYNO OPERATOR
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    My 540 is 16.8.1 best et and mph is at 30 degree's for me .

    1.16 60 and 5.22 in the 1/8 mile at 133

  7. #7
    Senior Member RACING JUNKIE
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    I used to run my 548 @ 32 degrees, made the most on the dyno at that point.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by rlmotorsports
    My 540 is 16.8.1
    :shock:

  9. #9
    Senior Member EXPERT BUILDER
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    any time u make changes a dyno is only a tuning aid!!!

    take the car down to the track, search for best mph!!!

  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by russ67chevelle
    any time u make changes a dyno is only a tuning aid!!!

    take the car down to the track, search for best mph!!!
    More often then not they will match for best of both worlds :wink:
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com


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