In The Shop: S&S Sidewinder Big Bore Kit

Every week, we see Twin Cam models that have already, well exceeded, 50k miles. Depending on how a bike has been maintained, 40k to 60k miles are milestones for larger maintenance procedures and repairs to be considered.

One of the most common overhauls is a top end rebuild. Freshening up the top end of your Twin Cam can be as straightforward as boring & honing cylinders, installing +.010″ oversize rings, a valve job, and all gaskets from the base gaskets and up. However, many riders, at this time, will opt to put together a performance package to achieve more torque and horsepower.

Recently, In The Shop, we had one of our regular customers drop off his 2001 Road King. He has been maintaining and upgrading this Road King every year since purchasing it approximately ten years ago. This year our focus was to address the stock 88 Twin Cam motor. The customer does not tend to pound on his Road King. His main objective for the rebuild was to put together a motor that would help him keep up with the larger motors that some of his buddies have in their newer HDs.

The package we put together was built around the S&S Cycle 100 cubic inch, Sidewinder, big bore kit. The kit from S&S is beautiful. It comes complete with pistons, rings, wrist pins & clips, cylinder dowels, all necessary gaskets & o-rings. The heads were given to our local, go to, machinist to be ported and drilled for compression releases.

See the photos. Really impressive work.

We installed S&S 510 cams with an S&S hydraulic upgrade kit. Also, S&S tappets and S&S Quickie adjustable pushrods. The bike already had a Power Commander V and a Barnett Scorpion clutch assembly. The Magnetti Morelli injection system on this 2001 still operates surprisingly well. However, the plan for next winter may be to convert this Road King over to a carburated fuel system.

OR, chain drive. If he starts laying belts on the ground with this additional torque!

Related Videos:
Harley Frame Swap
Harley Top End Removal
Cam Chain Tensioner Shoe

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12 Responses to “In The Shop: S&S Sidewinder Big Bore Kit”
  1. Blaine

    Will a 07 touring bike and a day a take the same top end kit if it was upgraded to the screaming egale 110 stage 1 kit

  2. ED

    I recently upgraded my 2012 Wideglide with an S&S Sidewinder Big Bore Kit. The original 103ci engine is now a 110ci and the s Dyna feels like an entirely different bike. I’m very happy with this upgrade…

  3. Norman Miller
    Norman Miller

    Got a question I’ve got a 2001 Electra glide ultra classic. The fuel check valve is leaking. Is both of the check valves the same or do I need to order two different check valves?

  4. mcveyrichard

    I have a 2007 Electric glide classic I want to do a big bore kit cams and clutch. I ride it long rides and around town. Long rides are 4,600 miles or more. Thanks

  5. JERRY

    I have a 2000 twin cam 88 I changed jugs and pistons for more power the ignition module is bad will you advise what do I replace it with??

  6. Brandon

    Did you replace the cylinder heads? I see in the some of the pictures the fins are not polished but on the finished motor they are finished? I’m only asking because I bought the same kit and my cylinder heads aren’t finished and I’m curious what it will look like going from polished to not

    • Customer Service
      Customer Service

      Hello Brandon!

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  7. Mark Flanagan
    Mark Flanagan

    I have a 2004 flat standed 88 can I fit a 98 or 103 heads and barrels to it thanks mark