Big Bore Kits

Our custom 107 kit, this kit is done by boring your cylinders, this kit can be done on engine 96 inch or 103 stock engine (2007-present). Cost on this kit with head gasket is $510.00 + shipping ( kit requires your core cylinders).

GMR Performance is proud to bring you Big Bore kits using nothing but the highest quality components. Big bore kits 95 and 98 CI and 103, 105 and 107 CI.

With Real world testing on these kits as well our own State of The Art in House Dyno facility. Our Big bore kits will not only deliver top performance but longevity and reliability as well. The 103/ 105 &107 kits work on all 2007-2013 Twin cam 96″ and 103″ motors. Our 107″ kit works with stock cylinder heads and valve train or if you are looking for the next level of performance complement your built with our Stage III CNC heads.

Prices starting as low as $525.00 + shipping for complete piston kit and bored cylinders (using your stock cylinders or core cylinders, core charge will apply).

We do offer an exchange program please contact us for more info on that.

Big Bore small