S&S 106 Inch Big Bore Top End Kit for 2007-2017 Twin Cam Models - Black Finish
Despite what some say, bigger is better, and if making something bigger is easy, that’s the best! A big bore kit is an easy way to achieve more displacement, and if you can install it without rebalancing flywheels or boring the crankcases, that’s about as easy as it gets. That’s the idea behind the new 106” big bore kits for 2007-up big twins. No need to bore or even split the cases, just do the cylinder swap. In addition to the ease of installation they look great because the cylinders are available with the same silver or black wrinkle powdercoat as stock, so they match the stock finish of your engine.
At 3.927” bore, these cylinders have the largest bore that we feel can safely be used in a cylinder with stock spigot diameter. In fact, this kit is only offered with cylinders because, even though stock cylinders can be bored to fit the 3.927” pistons, we are not confident that the material used to make the stock cylinder liner and spigot is strong enough. The cylinder liner material in the 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. There is a trade-off for the ease of installation, which is that only one piston oversize is available for this kit. This really is as big as we are willing to go with a stock diameter cylinder spigot.
Black Finish with Silver Fin edges
Fits 2007 - 2017Twin Cam Models
S&S part number 910-0206
Drag Specialties part number 0931-0434