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#9100077

NGK N4177 TR6 Spark Plug 602/604 Crate Engine LS1/LS Trk Set of 8

• Correct spark plug for GM 602, 604, and CT525 racing crate engines
• Works well in 4.8, 5.3, 5.7, 6.0, and 6.2 liter LS Gen III and Gen IV engines for higher horsepower and boosted street engines
• Features a 14mm thread and .690" reach with a 5/8" hex head