EFI’ng Great: TPIS ZZ 450
Fast-Burn heads reduce high-rpm valvetrain loading with lightweight retainers, 2.00-inch hollow-stem intake valves, and high-temp 1.55-inch sodium-filled exhaust valves. Weighing under 190 grams, they’re more than 60 grams lighter than an L98 head’s 1.94/1.50-valve and retainer combo. View Related Article
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