Well, I did figure this mess out. Turns out my alluminum heads have a thicker wall than a stock set would which would require a spark plug with more threads. I was finally able to get the specs on which plugs I could use through the Trick Flow tech guys. Thanks for your input!
Well, Metal as far as platinum plugs go, you could use Autolite's APP25, or NGK's UR4VX, or Bosch+4 (couldn't find a part #). Like other people have mentioned before, longevity and efficiency is what platinum is made for, wouldn't count too much on performance changes. If you're using a pretty stock ignition system I'd go with a .035 gap. Just buy a plug gapper, which looks like a Silver dollar, from the parts store so you can measure the distance between the center electrode and the wire electrode. Once you upgrade your ignition system, reset the gap to .045. Good luck. -matt
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66 coupe: 351W 30 over. Fiberglass shelby parts + flares
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