Originally Posted by JIm_Rockford
Ford never installed the 3valve in the econoline, the plug issue is from people that change plugs and are scared to really torque em down, about 25ft lbs in good, if they dont get tightened down and then they start working loose and them it pulls the threads out, They dont just blow out.

Not true. The Triton has a bad reputation for spark plugs blowing out of the block and taking the threads with them. A lot of people are confused as to why Ford never did a recall on them. Its weird because there is no common factor. It can happen to low mileage engines, high mileage, and anything in between.


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