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Built right at the factory for unparalleled quality. The re-designed combustion chamber, optimized for flow and efficiency. Heads come with larger than stock 1.898" intake valves and 1.623" exhaust valves and are equipped with Valve Spring Kit P/N 18223-98. At 72cc, this equates to a 9.5:1 compression ratio with stock pistons. Use 12mm Screamin' Eagle Spark Plugs P/N 32320-91.
Fits '93-'99 models when used with Original Equipment pistons, air cleaner, cam , exhaust, and igntion.
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