The SH103 is the largest production engine that S&S and Flathead Power™ offer for shovels. This engine features forged pistons with a compression ratio of 9.7:1, a Super G carb, and dual plugged heads. Unlike the SH93 and SH93H, the SH103 engine will not fit in a stock frame without modifications because the overall height of the engine is .300 inches taller than stock. This engine is recommended for high performance applications. This engine is not for everyone!
Features and benefits include:
- Natural crankcases and black powder coated cylinders
- S&S hydraulic valve train and roller rocker arms
- S&S Super Stock single fire ignition system
- 1966-1969 models have correct length sprocket shaft for stock primary and transmission
- Alternator models have correct sprocket length sprocket shaft for 1970-Up primary and transmission
- Two-year warranty
- S&S 640 camshaft
- Billet gear cover
- 1970-1984 alternator style big twin chassis
