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466 Posts
Discussion Starter · #1 ·
All the ford gurus .... Want to pick up some spark plugs and was wanting input. Have dove heads. 9.7-1 comp. 230 @.050 cam. 475-500 hp. Any recommendations??
 

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tintingsandiego
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1,063 Posts
I ran ngk 4 gapped at 42 for years. I have autolight 25 gapped at 42 in now. d3 heads
 

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i have always used motorcraft plugs in all my ford applications.i have seen engine performance issues with autolites,fords dont seem to like them.the motorcraft part number is ASF-42C
 

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JRPM/e-PerformanceMarine
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2,034 Posts
With the MSD I run .045 & .035 without MSD on all my Iron heads. Plugs are up in the air, everybody like one brand or another. I like the Accel header plugs with the U groove. Now I take those and put a 1/16" V in the end and that works for me.
 

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tintingsandiego
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1,063 Posts
UR4 Are a hotter plug. Didnt like the UR5 which is cooler than the autolight 25 and ur4
 
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