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Thread: Choosing the correct spark plugs Chev 400 w/ Alum heads...
          
   
   

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  1. #1
    onemangang's Avatar
    onemangang is offline CHR Member Visit my Photo Gallery
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    Choosing the correct spark plugs Chev 400 w/ Alum heads...

     



    I was just wondering what I need to know about choosing the correct spark plug for my SBC 400- 40 over w/ alum heads and about 10 on compression. I found out that the Accel shorty header plugs that I was using were too short when I took the heads off. By this I mean the "reach" was not long enough to actually reach the combustion chamber, but it still worked. I actually need a 3/4" reach plug. I don't know how to figure the hot or cold requirements that I need. Any help would be appreciated.
    Gas Grass Or Ass-Nobody rides for free!!!

  2. #2
    dr_bowtie's Avatar
    dr_bowtie is offline CHR Member Visit my Photo Gallery
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    in an AC plug you'd be a r43ts or I think R-43-TSL for long if I remember correctly

    Just use plenty of Anti-seaze....

  3. #3
    383 chev's Avatar
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    who is the manuf. of the head. i have iron eagle after market
    and they recommend r46ts maybe ur head manuf. has recommendation

  4. #4
    onemangang's Avatar
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    The heads are actually a reprodustion of a Dart II head. There made by PBM-I think there a chineese knockoff but they flow well. They are 2.02/1.60,
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  5. #5
    383 chev's Avatar
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    I think that u can can run a colder plug in a aluminum head
    too but if i am wrong some 1 correct me so i would run a
    r44ts or a r45ts. the 45 are probably your best bet.

  6. #6
    onemangang's Avatar
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    Thanks for the replies guys but those plugs your suggesting are all .460 reach plugs...I need a plug w/ .750 reach or it doesn't make it to the combustion chamber. I've been cross refrencing these w/ sparkplugs.com. Any other ideas....can I just get a plug with that reach? Talking to the local parts counter "fools" is frustrating if you don't have a part # I'm sure you have all dealt w/ them before. They only know what the computer tells them.
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  7. #7
    dr_bowtie's Avatar
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    It would be a R 44tsxl

    The XL is extra long reach....
    I suggested a 43 because of 10:1 compression.... I would start there.... if they foul from being too cold ...step up to a 44...but I think 43 is where you want to be....

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