Recommended for 89in.-100in. engines with 9.5:1 to 11.5:1 compression ratio. Provides best performance from 3500-6500 rpm using ported stock heads or S&S heads. Requires adjustable pushrods and covers (AP-292085, CM-2255-36, CM-2254-2), spring spacing or high lift valve springs (AV-VSK6000), and normal clearance checks.
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