This engine is based on the long standing 103 Shovelhead style Sidewinder kit, which has been in the S&S catalog since 1976 The 103 is similar to our other Shovelhead style S&S engines, just bigger Features S&S Super Stock crankcases, S&S forged steel flywheels and connecting rods, S&S billet tappet guides with Evolution style S&S tappets, S&S Quickee pushrods, S&S billet rocker boxes, S&S forged roller rocker arms, and S&S 3-5/8" bore, engineering grade, cast iron, 3-5/8" bore cylinders with forged pistons Due to the displacement and compression ratio, an S&S Super 'G' carb and S&S dual-plugged heads come as standard equipment The 103 is only offered in 1970-84 Alternator style, and comes with the S&S Super Stock Ignition System The 103" Shovelhead style S&S engine is .300" taller than a stock Shovelhead, which means that it's not going to fit in a stock frame (Stock frames need to be modified to accommodate the extra engine height) To maximize engine life, all Shovelhead style S&S engines are built with the finest components, S&S forged steel connecting rods and flywheels are the industry standard for strength and durability High tensile cast iron cylinders are super strong and extremely wear resistant Engines Specifications are 3-5/8" Bore, 5" Stroke, 103" Displacement, S&S Forged Piston Type, 10.7:1 Compression Ratio Covered by a 2- year parts and labor warranty S&S engine are shipped without oil Not legal for sale or use in California on any pollution controlled motor vehicles Billet Rocker Box Material