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For Branch heads: this valve is .060" shorter than stock so valve can be sunk in the head to clear the piston on high lift cams. For STD heads: special, extra flowing, oversized valves, available in two head sizes., Black Diamond exhaust valve for STD heads Stem .3095" Head 1.650" Tulip Profile 24O Length 4.480"
High-Flow racing valves made from special super alloy by Precision Machining as a replacement for Branch and STD cylinder heads on Evolution Big Twins but also suitable for custom tuning jobs.