Blowsion 1-Piece Billet Head Kit for Yamaha 701 and 760 Engines. The new Blowsion one-piece Yamaha Billet Aluminum/CNC Performance cylinder head kit gives you the best of both worlds with excellent horsepower gains, better cooling capacity and a price that is easy on the wallet. These state-of-the-art heads use the same replaceable domes of our popular 2-piece girdled Yamaha heads and utilize an improved squish band design for easy tuning and more compression for pump gas friendly horsepower. Up to 70% better cooling, increased reliability and CAD designed combustion chambers ensure maximum performance and long engine life. Blowsion Girdle Kit available for those looking for maximum cylinder support. Head includes brass water fittings, o-rings and installation instructions. Installs with OEM Yamaha Cylinder Head Bolts or Optional Stainless Steel Head Hardware Kit (Sold Separately).