The beauty of this 106″ kit from S&S Cycle, in addition of making your engine bigger, is that it’s an easy installation without need of any machining. No need to rebalance flywheels, to bore the crankcases or even split the cases. That’s about as easy as it gets to get more displacement. Time and money saved!
You just do the cylinders swap. These S&S cylinders are available with the same silver or black wrinkle powdercoat as Harley models, so there is no risk of mis-match with the rest of your stock engine. In fact, this kit is only offered with S&S cylinders because, even though stock cylinders can be bored to fit the 3.927” pistons, S&S is not confident that the material used to make the stock cylinder liner and spigot is strong enough.
The cylinder liner material in S&S cylinders is much stronger, and has proven its ability to stand up to the added power in numerous dyno pulls, street miles, and a lot of quarter mile drag strip runs. The 106” big bore kit yields excellent results with stock cylinder heads, but a performance cam is recommended to get the best performance and to make the engine easier to turn over at start-up. The SuperFlow® Cycledyne shows an increase of nearly 30 horsepower and 20 ft/lb of torque with the 106” top end kit. S&S Cycle.