Posted by Gary in CO [64.234.252.221] on Tuesday, March 26, 2013 at 12:08:48 :
In Reply to: 318-3 Timing posted by Dave Horvath [24.131.120.209] on Monday, March 25, 2013 at 19:39:01 :
Hi Dave, this does not answer your question, but I had trouble with the insulators splitting in half on Champions, I run Bosch and recommend them. Helped with fowling. Autolites are good too. Also I show RJ12YC / J12Y Champions for a poly 318-1.
Gar
Spark Plugs (Poly 318-1) 59-67 Champion spark plugs RJ12YC / J12Y
Spark Plugs (Poly 318-1)* 59-67 Autolite AT42
Spark Plugs (Poly 318-1)*** 59-67 Bosch Platinum (recommended) WR9FP
Spark Plugs (Stroker Poly performance) NGK R5670-8 V-Power Racing Plug (R5670-7 hotter)
Spark Plugs (Poly 318-3) 67 Champion spark plugs F10 (18mm, W500, 2 ton truck)