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TR4/4A Spark plugs

bammons

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If I have the 87mm piston/liner set and the BP270 Newman cam does this change my spark plug requirement? Bruce
 
Someone may have your same combination and have the perfect answer. In the mean time, I would recommend starting with the OEM plug and see how it runs. If it tends to foul or carbon up prematurely, move to a higher number for a “hotter” plug to keep the plug clean. If the plugs run for a while and come out chalk white, or you get detonation at normal timing settings, then move to a lower number plug, so it runs cooler.
 
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