That probably caught your eye. Hey, I appreciate all the help you guy's have given me and I have another problem. The 302 long block I am building up came with 351 heads as my old one (1975) had but the size of the spark plugs is different. They are both tappered. The old head had 18mm (13/16) and called for F-10 champions, C-831 AC, or Autoloie 115's. The new heads I assume are a later year type because the valve rockers are held on with bolts and the old ones were studs. What plugs should I use. I run 87-89 octane and have a 165 degree thermostat if that matters.
