S&S, 93" (1522cc) 3-5/8" big bore cylinder & piston kit

66-84 Shovel (NU). With 4-1/2" stroker flywheels

The most popular large capacity option for 66-84 Shovelhead models. This kit gives both dependability and a good performance increase. Must be used with 4-1/2" stroker flywheels. Comes complete with +.124" (5.405") 3-5/8" big bore gloss black cylinders, forged pistons, rings, wrist pins, head/base gaskets and cylinder head bolts and cylinder base nuts. Compression ratio around 8.2:1. Engine life can be expected to be very good/good, strongly depending on riding habits. Note: Crankcase spigots must be bored for 3-5/8" cylinders. Note: 4-1/2" stroker flywheels (MCS 512368) must be purchased separately.