Question about 2003 Ford F150 Regular Cab

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Indexing plugs on a 2003 F-150 4.2 V-6

Being a mechanic for some 35 years. I,ve always found that taking time to work with and understand spark plugs. A lot can be gained not only in the power catogory but also in gas milage which means the world with todays fuel prices. My question is. I want to index the plugs but not to knowledgeable on my Ford 4.2 V-6 valve layout. Can you tell me? Do I want the open end of the plug at 12 o-clock? 6 o-clock or? I know we used to put the opening of plugs on big and small block Chevys for dragracing at 12. Also Ford calls for 52-56 thousands on the gap but wonder your thoughts on opening them to 60 maybe as high as 70 to increase the sparks duration of fire. But I dont know if the ignition can produce enough power to fire the plug long enough to burn more of the cyl fuel. I know when I close up to 50 and down, the power is up but fuel milage drops noticeably. Also wonder about the air intake. Right now ford has the filter housing going into the drivers inner fenderwell which to me doesnt seem like enough air and certainly the more air the better burn. Thanks Randy Havlicek

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For gapping this particular 4.2 v-6 the proper gap you want to be at is 54 this is proper gap anything less or anything motor with make you engine run rough
you dont want to have too much fuel in the piston block unless you plan on drag racing your truck and then want to do a complete piston tear down after ran 54 gap is perfect balance for spark plug gap and fuel effeciancy
now if you want a better fire i would go with a split spark to help with increase spark in plug

with the filter assembly they make a converstion kit that goes under the front bumper as a scoop to give more air to the engine it just bolts up to bumper if your looking for more air this would be it

out on after market there is a fuel saver device that connects your trucks computer and you can program it for kind of driving fuel milage you need threw the jeggs catalog its a nifty device i have one and i get on a tank an better average of 50 more miles out saving and you can set for hauling or racin i think this is what you will be more needing

on setting the sparky at a 12 oclock position this is something new too me i have just heard of even though i work with the hibilie racing team for more than 8 years
i would like to hear more of this 12 oclock setting as this is new too me iguess some secrets are left to the mechanic crews can you give me discription to my email about this at shaggyrat@hotmail.com i would appreciate it thank you

Posted on May 31, 2008

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