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Thread: Which plugs to run

  1. #1
    SED253
    BBC..454...781 heads...B&M 250...5-7 lbs boost...which plugs should i run and what should i gap them at....Thanks in advance

  2. #2
    SED253
    OK...what not enough info....Have full MSD ignition also...Surely somebody runs spark plugs in the engines(haha)

  3. #3
    SED253
    What nobody wants to give out any info...what gives

  4. #4
    Fiat48
    Go here:
    http://www.ngk.com/search_char.asp?...manufacturerID=
    Heat range 8 is what you want.

  5. #5
    SED253
    Thanks..at least someone is reading this...will try the link you sent

  6. #6
    cfm
    Merc uses the Delco R41T's on their 525SC (7.4 supercharged) package. I would think the R41T's or slightly warmer R42T's will work fine.
    Gap is dependent on your ignitions ability. Most ignitions - if engine is tuned right - should be fine with normal .035" gap.

  7. #7
    IMPATIENT 1
    BBC..454...781 heads...B&M 250...5-7 lbs boost...which plugs should i run and what should i gap them at....Thanks in advance
    what do you expect this mill to put out? i've got some 781 heads i'm thinkin about runnin with 8-9lbs of boost.

  8. #8
    LynnsJet
    Autolite 145's
    L J

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