TC113 Kits

For both EFI or Carb Models

After reading about each kit, click the appropriate button at left to see all possible options you may want.

The above photo is for visual representation only. Parts may vary slightly for different jobs.

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.  

We are offering our 113 inch kits for all TC models in only one configuration which suits both touring and performance enthusiasts.

Sport Touring  packages will have a compression ratio of 10.5:1 and should be used on Baggers and heavy Softail models used for touring and two up riding, especially in regions that have steep grades and/or lower octane fuels. 

Power and fuel mileage expectations.    Torque       Horsepower         Mileage
Sport Touring                                           125-135         110-120            45 MPG

HQ-TC-113-ST       Twin Cam 113 Sport Touring 10.5:1 compression ratio

The following is a complete list of parts and labor required to build the Head Quarters Twin Cam 113 Sport Touring performance package.

    Qty  Part #                         Description

                                                 HEAD WORK
    1)  HVP-TC                          Your heads completely reworked, ready to bolt back on.
         HVP-TC-MCR                  (as above with mechanical compression releases installed)
         HVP-TC-ECR                   (machined for HD electronic compression releases. not supplied)
    1)  HQ-HEAD-BOARD    Fin Protector (heads bolted to this for shipping)

                                                CYLINDER WORK
    1)  HQ-7100-C                   Bore  (4.060") TC cylinders to 4.065"
    1)  HQ-8-62873                 Pistons, forged dished top to match stock chamber
    Unfortunately we can no longer buy cylinders from Harley-Davidson and supply them so we have provided the part numbers so you can purchase them from a dealer yourself. The cylinders come with head and base gaskets.
                    Cylinder set, Black & hilite fins as per stock heads
                   Cylinder set, Silver & hilite fins as per stock heads

                                               RECOMMENDED PARTS
    1) HQ-4055                       Pushrods, adjustable EZ install type
    4)  HQ-4225                       Hydraulic lifters, Black Ops type
    1)  17033-99                       James rocker cover gasket and seal set

                                       Cam Choices as per drive type and appropriate year

    1)  HQ-TC-575                      Cam, chain drive 1999-06 models (except 2006 Dyna)
    1) HQ-TC-575-G                 Cam, gear drive 1999-06 models (except 2006 Dyna)
    1) AP-288901                 Kit, gear drive install
    1)  AP-288908                  Kit, gear drive, 1999-06 (except ‘06 Dyna)
    1) HQ-TC-575-HC          Cam, for all 2007-’09 models including ‘06 Dyna

                                        Additional parts for carburetor equipped models

    1) HQ-7025-A                  Port, intake manifold (send us your manifold)
    1)  HQ-6100                      Ignition, preprogrammed for 1999-03 models
    1)  HQ-6104                        Ignition, preprogrammed for 2004 & later

                                                   Optional Parts (not required)
    1) HQ-32679                      Show off your build with a Head Quarters timing cover
    1)  HQ-4600                       Roller Rockers

If you want this job done you will need to print a work order to send along so we know exactly what you need.
Click the red link below to find a work order for this build and print it off.
HQ-TC-113-ST Work Order

You can price any part or the whole job by viewing or printing off a price sheet found on the red link below.