TP Engineering Pro-Series 121" Harley Big Twin Polished Evolution Style Engine

Fits Harley Evolution Big Twin Applications 1984-1999. Pro-Series motors are assembled with the highest quality of American-made components. Features, Pro-Series Breakerless Ignitions and Mikuni Carburetors, complete with air cleaner. Includes TP Engineering's chrome billet pro-vent rocker boxes , chrome billet cam cover, patented billet oil pump, forged flat-top pistons, CNC-ported heads, forged steel roller rocker arms, stainless steel valves and American-made tappet blocks. Has manual compression releases installed. Engine case, cylinders, cylinder heads, oil pump and tappets are polished to a high-luster finish. All assembled Pro-Series engines are pre-run to ensure consistent quality and performance right out of the box. Polished motors have polished crankcases, tappet blocks, cylinder bases, head fins and spark plug areas. Made in the USA SPECS Bore 4.125 Stroke 4.5 Compression 10.4:1 Intake valve Diameter 2 Exhaust valve Diameter 1.625 Intake duration @ 0.053 262 Degrees Exhaust duration @ 0.053 266 Degrees Valve lift Intake 0.630 Degrees Valve lift Exhaust0.0650 Degrees Carburetion 45MM Mikuni Pushrods Adjustable Rocker Boxes Pro-Vent Chrome Billet Ignition Pro-Series Breakerless Single-Fire Rocker Arms Pro-Series Forged steel Roller Oil Pump Pro-Series Patented Billet Compression Releases are Standard Horsepower 121 @ 5500RPM Torque 125 @ 3900RPM INCLUDES 121 Polished Engine Manufacturers Statement of origin.