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spark plug

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i have modified LSA engine street use and off road m using 93 octane and aem m1 meth

what is the best spark plug iridium heat range 7 or 8 or brisk is better?

It really depends how modified your engine is or in other words how much power your engine is making. Generally for a moderate power upgrade over stock I'd look to move 1 heat range colder than stock. It's a balancing act because for a street car in particular, a plug that's too cold is prone to fouling.