Posted by jerry bishop on June 14, 1998 at 20:31:51:
In Reply to: Re: M37 spark plugs posted by T.KRALOVIC on June 14, 1998 at 12:45:03:
I used J-8 Champs in my 47 and 55 model motors that I had in my PW and those worked real well ! If I remember right the range of plugs for that flat head was like J-6 to J- 11 ! Hope these helps- Jer