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ASTM D4741 3
or they don't work well in cold climates
this cylinder head is designed with a 1991-2006 4
and include necessary installation hardware
14mm Thread - .708 in Reach - Tapered Seat - 4 Pack 1984-pontiac-firebird-esi1382254 ASTM D4741 3ACCEL HP Spark Plugs are made with a Copper core which is a better conductor than Platinum and Iridium. They deliver a stronger spark especially in high performance applications where high combustion pressures are present. Copper is much better at dissipating heat than other materials which lessens the chance of a misfire. ACCEL HP Spark Plugs are gapable allowing you to open the gap exposing a larger flame kernel or close it if needed for high boost
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