High Performance Tappet Cuffs for 2017-18 Harley Milwakee-Eight Models

The latest iteration of the beloved Big Twin is proving to be a stout motor that responds well to hop ups and a sound flogging, making it a favorite of S&S Cycle. One of the components S&S was not happy with is the plastic tappet guides that could potentially let tappets twist under high RPM and when coupled with high lift cams.

So, S&S developed a clean solution in their new machined aluminum and hard anodized Tappet Cuffs. Designed to stabilize tappets in high performance M8 engines, these should pair well with any cam change and are a must have for Stage 2 and above builds. $44.95. More info at.

5 Responses to “High Performance Tappet Cuffs for 2017-18 Harley Milwakee-Eight Models”

  1. 1 HD Rider Jan 27th, 2018 at 11:24 am

    Sounds like a solution looking for a problem. Never heard of any issues with this — I noticed that S&S indicated it was a potential problem, not one they have actually experienced. Maybe they should focus on actual issues with the motor, of which there haven’t been many so far. Initial Oil pump and rocker shaft issues are all I’ve heard of so far.

  2. 2 Lyle Landstrom Jan 28th, 2018 at 11:11 am

    In response to what HD Rider said, the article specifically states these are for high perf. engines. Assumably with higher cam lobs and stiffer valves springs. Having said this, I didn’t know this was ever an issue on older style engines with a similar tappet pushrod system.

  3. 3 Biggles Jan 28th, 2018 at 12:51 pm

    S&S will bring out a complete engine soon to fix the factory’s usual bad quality engines.

  4. 4 Chris Jan 29th, 2018 at 10:10 am


    Evo tappets were prevented from spinning by the tappet blocks, Twin Cams tappets were retained by a steel pin, M8 tappets by a plastic collar. This seems to be about keeping that tappet wheel running nice and true along the cam lobe.

  5. 5 BOSS HAWG Jan 29th, 2018 at 10:33 am

    I have a complete Stage IV setup (Pro Race Tuner, Exhaust, Race dynoed, etc…) on a 103 Street-glide. Have literally run the pure dog piss out of it with rev-limiter red lines quite often.

    Say what you may, but I haven’t been able to tear it up. Ride my stock (wink wink) 103 Low Rider most other times when close the house.

    My opinions are still reserved for the M-8.

    Boss Hawg

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