Predator Sparkplugs And Milled Heads

#1
What are you guys doing with the spark plug on milled heads. My head is milled .050 and I noticed that the spark plug sits below the head surface. I have .035 piston to head clearance will I be fine or do I need a shorter plug or some kind of shim?
 
#2
Use indexing washers. You can find them on ebay in an assortment of thickness's. They are different colors for the various thicknesses.
 

65ShelbyClone

Well-Known Member
#4
A non-projected plug will be about 0.050-0.075" shorter.

Just take the "P" out of the NGK part number. BPR5ES = projected, BR5ES = non-projected with all else being equal.
 
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