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Thread: 540 bbc spark plugs

  1. #1
    Junior Member APPRENTICE
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    540 bbc spark plugs

    To all that can help, I am running a 540 bbc on the street . Compression is 9:6.1 flat top ,Cam is a solid roller isky .313dur. int. .276@.050 .730 lift cam is degreed in at 106.375 and valve to piston clearance is .097. Heads are brodix bb-2 plus and intake is hv 2000 , heads have been flowed and mild port work. They flow on the intake at .700 lift 377 exh.277 carb is a quick fuel950 p series mech. I am currently using autolite #3924 plug,the ground strap heat mark is in the centered from the electrode tip to the middle of the ground strap is this showing the correct range? And the #1 and#2 cylinders are showing alittle more richness than all the other plugs. What is causing theses cylinders to run diferently.

  2. #2
    Senior Member EXPERT BUILDER
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    as for plugs, alot of people run ngk vpower plugs,good value easy to read,especially sprayed motors...call your head manufacturer they will know best ngk vpower...

    the fronts are rich,well the middle 4 will be leanest, usually the rear two are fattest cause of g forces when launching...so what gives with the fronts,,, dont have a clue

  3. #3
    Senior Member RACING JUNKIE
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    Same heads, 468, 10.2 comp. smaller cam .660 lift. 454R manifold, 1050 dom. NGK 8's, tried 9's but too cold.

    Zip.

  4. #4
    Senior Member RACING JUNKIE
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    NGK V power #8 heat range.

    On a side note:

    I used to get these plugs from the napa warehouse here in Memphis, always in stock and only 1.99 a pop - no brainer right?

    I called the other morning to get me a set.
    Nope, no longer stocked them.
    Said I would have to come in and pre-pay to order them and then pay $8 for shipping :shock: Thought that was pretty shitty of them.

    Called O-Riely's, said they didnt stock them but could have them in by noon.
    Price> 1.99
    I told them, they just got a new customer.
    Might wanna buy some O-riely stock guys...lol


    Cp
    ***IN GOD WE TRUST***

  5. #5
    Senior Member RACING JUNKIE
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    Get a champion or stay with the autolite, there was a loss in HP just putting the NGK;s in mine ..
    seen more ngk's cause a miss then any plug
    David Lanning
    IHRA NHRA 387B

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

  6. #6
    Senior Member EXPERT BUILDER
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    call your head manufacturer for the specific size plug, then everyone is gonna have their own favorite

    i run 5671-7 on motor 8s on a small shot nitrous, and 9's for up to a 275 shot, ill never run anyother plug(mostlikely)

  7. #7
    Senior Member RACING JUNKIE
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    I run brodix 2X heads and use NGK 8's

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by hammertime
    Get a champion or stay with the autolite, there was a loss in HP just putting the NGK;s in mine ..
    seen more ngk's cause a miss then any plug
    Maybe you had the incorrect heat range? I used to run #9's years ago and had problems with a top end miss after a bit. Dropped down to #8's never missed a beat.
    In fact the plugs I have in mine now I put in last spring, still popping off perfect, just wanted a fresh set.

    I've heard good things about autolites too, only thing I'd put a champion in is, my lawn mower :shock:
    ***IN GOD WE TRUST***

  9. #9
    Senior Member RACING JUNKIE
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    Quote Originally Posted by cepx111
    Quote Originally Posted by hammertime
    Get a champion or stay with the autolite, there was a loss in HP just putting the NGK;s in mine ..
    seen more ngk's cause a miss then any plug
    Maybe you had the incorrect heat range? I used to run #9's years ago and had problems with a top end miss after a bit. Dropped down to #8's never missed a beat.
    In fact the plugs I have in mine now I put in last spring, still popping off perfect, just wanted a fresh set.

    I've heard good things about autolites too, only thing I'd put a champion in is, my lawn mower :shock:
    champions a full 5 faster then both 8 and 9's .. the only thing close to the champions were a autolite 3932 and 3910, accels were right on target with the autolites. I never used to like champions either .. my engine shop swears by them :wink:

  10. #10
    Senior Member MASTER BUILDER
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    I used Autolites 3933s in my Dart 355 headed 540 with a 14.2 compression. The dyno guy liked the way they looked after 15 dyno pulls.


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