Billet Head Kit / AXYS 800 (18+)
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Easy bolt-on power for your 2018 AXYS 800! This head has twice the cooling capacity to keep your motor running cooler to maintain horsepower by staying below the 120-degree timing curve.
We offer two different dome configurations:
800-37.5 is a 12.5:1 compression ratio that works great in the 6000-9000 ft range and bolts on 7-8 HP in the mid-range and 5-6 HP peak.
800-41 is our lower 11.8:1 compression version for sea level to 6000 ft and gains 4-5 HP. The stock 12.1-12.2:1 compression ratio makes the motor's detonation sensor kick on very easily and won’t allow you to lean out the motor for extra power. By bolting on this version it allo
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