I believe mine is 14 x 1.25 also.. I know that is the size/pitch for the air galley holes in the head and the spark plugs holes.. Don't have my manuals handy to check for sure though..sorry

JD


88 Pickup,4x4, 2.6 L, AMC head, K&N Air filter, Aisin Hubs, Redline Oils everywhere, 94 Trooper wheels.