We think the 113 motor might just be one of the best all around combinations available for the Twin Cam motor. Our package uses a set of 4.060” bigger bore cylinders and will require a 4-3/8 stroke crank (stock on 2007 models) along with a set of Head Quarters HVP cylinder heads and cams.
If you have a 1999 thru ‘06 model, you will need to purchase a crankshaft assembly from a specialist like Dark Horse or your HD dealer.
All years of the Twin Cam motors will require case boring to accept the larger bore cylinders. Instructions are supplied with the cylinders and it is very basic machining for anyone with a milling machins, angle plate and boring head.
The forged CP Pistons used in our kits are a Head Quarters exclusive featuring a 7cc dish in the tops to accommodate the use of stock heads and permit us to create a 10.5:1 compression ratio.
Doug (HQ owner) uses one of these motors in his own FLH Classic and believes it to be the ultimate touring motor.
The increased stroke provide better mechanical advantage through rod leverage and the results are higher torque figures at a lower RPM. With stock bore carb or throttle body, 2,000 RPM cruising is possible with plenty of power on tap through the whole mid-range.
If you want that 454 big block in a Camaro feeling when you turn the throttle, this is the way to go.