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1. 

   Joined: Dec 20, 2018
   Posts: 66

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   70executive-Catalina

   Member

   from Canada

   hi,
   
   I’ve got a set of 1965 461 heads and am wondering what reach spark plug can I use? Is .750 inches too big? Thx

    

   70executive-Catalina, Dec 26, 2019

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2. 

   Joined: Dec 3, 2009
   Posts: 14,465

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   Johnny Gee

   Member

   from Downey, Ca

   Current AC Delco R45 is .370
   

    

   Johnny Gee, Dec 26, 2019

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