That's what I surmise but only a guess. Rich Kinsley '64 Dodge Polara 4dr 318poly w/goodies ===================================================================== Tom Watters wrote: > > Isn't the -12, -14, -16 the heat range? So the 16 would be two steps > hotter than the 12. > > Rich Kinsley wrote: > > Rich Kinsley '64 Dodge Polara 4dr 318poly w/goodies > > > > I have had problems finding spark plugs that fit and work. I just don't > > want Champions and the good Autolite 75's are not made anymore from what > > > > I see. The Autolite 85's are a different heat range and just don't work > > as well. The problem with my engine is the reach. The 75's and 85's are > > 3/8" reach (.375). I had tried some others and carefully turned the > > engine bt hand and I found the domed pistons hit the electrod and bent > > it. I don't need to ventilate my pistons! > > > > Here's what I spotted at Summit. E3 spark plugs with .375 reach , one > > designated as #ETP-E3-12 and the other as #ETP-E3-14. They are $2 each > > right now. Ther is also a .307 reach #ETP-E3-16. I think they sound like > > > > they'd work. Would the "12" be the coldest?? I was thinking of trying > > them. > > > > Gary P, et al, got any input??? > > > > > > ---- > > Please address private mail -- mail of interest to only one person -- > > directly to that person. I.e., send parts/car transactions and > > negotiations as well as other personal messages only to the intended > > recipient, not to the Clubhouse public address. This practice will > > protect your privacy, reduce the total volume of mail and fine tune the > > content signal to Mopar topic. Thanks! > > > > '62 to '65 Mopar Clubhouse Discussion Guidelines: > > http://www.1962to1965mopar.ornocar.org/mletiq.html. > > > > > Rich Kinsley '64 Dodge Polara 4dr 318poly w/goodies ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.