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Recommendations for best spark plug spec for a 302 needed. I bought the engine as a 'short' engine, with nothing on it, Inc plugs. I think it is originally from a 1980s truck, but it's now been completely rebuilt, and running a stage 2 cam (or was it stage 1?) along with a FiTech fuel injection system. I'm in the UK, so big, widely available brands would be best please.
 

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Are they factory cast iron or aftermarket aluminum heads? Most aftermarket heads use a longer reach plug with a gasket seal vs. the shorter reach, tapered seat type used in a production head.
 
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