This truck has the factory ignition spark set-up. So, sounds like .042 - .046 will work?
Yes, somewhere in that range. I generally gap mine at .044.
As far as aftermarket ignitions (Mallory, MSD, Crane, Jacobs, etc.), some recommend opening up the gap due to more electrical current being available with their system. You'd just need to play with the gap based on the recommendations of the respective manufacturers.
hi sorry to buzz in. what do you think the gap should be when running an MSD system?
I run 8.5 mm wires and premium cap and rotor and have my plugs gaped at .60 the truck runs great with smooth idle and great performance.
The TFI coil is the difference, I could have bought a Blaster oil filled coil but the TFI Ford coil does a better job and you can pick one up at the auto wreckers for cheap, also make sure you remove the resistor form the ignition wiring it has one, the one that goes to the coil.
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