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are all 305 heads the same with respect to plugs?

Discussion in 'Early CJ5 and CJ6 Tech' started by 57cj5, May 7, 2014.

  1. May 7, 2014
    57cj5

    57cj5 Member

    North Carolina
    Joined:
    Aug 31, 2005
    Messages:
    593
    When picking spark plugs for my 283 with 305 heads, does it matter what year the 305 heads were made? I am not sure what vehicle they came from, just that they are 305 heads. When searching for plugs, all the sites ask for a year, car,etc.. Would it make a difference to randomly pick a year? or is there a better alternative?
    Thanks,
    Paul
     
    57cj5, May 7, 2014
    #1
  2. May 7, 2014
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    Maybe that question is better asked on a Chevy forum?
     
    timgr, May 7, 2014
    #2
  3. May 7, 2014
    Mike C

    Mike C Member

    Austin, TX
    Joined:
    Feb 19, 2007
    Messages:
    743
    The iron heads should all be the same. GM switched from washer seat to taper seat plugs around 1971. The 305 didn't come out until '76 I think? So they should all be taper seat plugs. With the valve cover off you could decipher the date code to know for sure what year it is. Aluminum 305 heads would be different most likely.
     
    Mike C, May 7, 2014
    #3
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