We also put a plateau honed finish on them to help reduce break-in time. The cylinders are then honed, using a three stage process to reduce heat and produce round, precisely dimensioned bore. We take the time to bore them in three stages to reduce both heat and micro-fracturing of the metal. Unlike many shops that simply hone them out, our cylinders are precision bored using either a Kwik-Way air-centered boring machine or our new 5 axis CNC milling machine. Our big bore cylinders are bored and honed using JIMS torque plates to ensure a "round" bore. The 107" kits fit 2007 and later engines. The 105" kits fit 2007 and later engines, as well as older engines with a 4-3/8" stroke. The 96" kits fit 1999-2006 TWIN CAM engines with stock 4" strokes. We strive to deliver the highest quality heads in the industry - and back them up with our "No Hassle 12 month Warranty". Sold as a set for as low as $699 exchange or if you prefer to keep your bike's original heads, we can perform our "magic" on them for the same price.įor more info on Stage I, II, or III heads, call us at 81 or Email usĪMS Hi-Performance 96", 105" and 107" Big Bore Piston and Cylinder Kits. Finally, heads are decked /surfaced, CC'd, and assembled with hi-temp resistant Viton stem seals, valve seating pressure is tested, and valve closure/sealing is vacuum tested. We also coat the exhaust ports with a ceramic-metallic thermal barrier to reduce both head and oil temps, as well as enhance the exhaust gas flow velocity. Heads are 5-AXIS CNC on a Centroid CNC Machining Center and /or custom hand ported, and flow tested to enhance both torque and power in the valve lift and rpm ranges most suited for use with the best performing street cams. Combined with our specially machined valves, the multi-angled seats perform with maximum efficiency and reliability.
We form the valve seats with a state-of-the-art Newen CNC Contour machine, to our unique multi-angle shape. AMS Hi-Performance Ported Cylinder Heads for TWIN CAM engines.ĪMS heads are thoroughly cleaned and inspected, then machined to exacting specs.
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