Correct Spark Plug
+ Reply to Thread
Results 1 to 4 of 4

Thread:
Correct Spark Plug

  1. #1
    79 Sanger Picklefork Tittyman's Avatar
    Join Date
    Dec 2007
    Location
    Coeur d'Alene, Idaho
    Posts
    857

    Default Correct Spark Plug

    I have an original later 1970'S LS7 BBC with 12 to 1 compression..iron heads, TR with dual quads..The boat has always been run on boost or avgas..the plugs are AR135..That's what was in it when I bought the boat and have replaced with the same thing...I just ordered new AR135 and I'm not sure even if that's the right plug..I think AR135 are for small blocks..sugggestions..thanks..
    Last edited by Tittyman; 06-03-2010 at 06:43 PM.
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member skippers WFOT's Avatar
    Join Date
    Feb 2010
    Posts
    517

    Default

    i think in the early 70's they never produced the LS7 but they put LS7 intakes on some of the 454 engines as performance upgrades. your best bet would be to run a search on the head cast numbers to be sure what plugs to run.
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

  4. #3
    Senior Member Futs's Avatar
    Join Date
    Dec 2007
    Location
    Orange CA, Big River
    Posts
    4,549

    Default

    Four different spark plug types have
    been used over the years. From 1965 to
    1970, cast iron heads used 3/4" reach,
    13/16" hex, gasketed plugs. From 1970
    and later heads used 1/2" reach, smaller
    5/8" hex, tapered seat sparkplugs. Early
    aluminum heads used 13/16" hex, gasketed
    plugs, 3/4" reach. “Bowtie” aluminum
    symmetrical port, race heads require a 5/8" hex, .708" reach, tapered seat plug.

    http://www.zex.com/Products/SparkPlugs/app.asp

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    79 Sanger Picklefork Tittyman's Avatar
    Join Date
    Dec 2007
    Location
    Coeur d'Alene, Idaho
    Posts
    857

    Default

    Quote Originally Posted by Futs View Post
    Four different spark plug types have
    been used over the years. From 1965 to
    1970, cast iron heads used 3/4" reach,
    13/16" hex, gasketed plugs. From 1970
    and later heads used 1/2" reach, smaller
    5/8" hex, tapered seat sparkplugs. Early
    aluminum heads used 13/16" hex, gasketed
    plugs, 3/4" reach. “Bowtie” aluminum
    symmetrical port, race heads require a 5/8" hex, .708" reach, tapered seat plug.

    http://www.zex.com/Products/SparkPlugs/app.asp
    Thanks futs..
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95