S&S Cycle HPT542 Cam Chest Kit — Chain Drive, Oil Cooled, Black Pushrod Tubes — 2024-Up M8 Gen 2

The complete S&S cam chest for the Gen 2 Milwaukee-Eight, built around the HPT542 cam — S&S's bolt-in grind for the 2024-up oval-port engines. One box gets you the cam, the billet cam plate and oil pump, Precision tappets, tappet cuffs, and Quickee pushrods, all matched by S&S.

FITMENT

Fits 2024-up Harley-Davidson M8 Gen 2 Touring models with oil-cooled engines. The HPT542 cam is a bolt-in for Gen 2 M8 engines with oval port heads (117 and 121 non-VVT). S&S notes the 542 cam can also be run in 2017–2023 Gen 1 M8 engines, but only with S&S high-lift valve springs (.605 in. lift) — if that's your plan, email us before ordering so we spec it with you.

Not sure it fits your bike? Email info@norcalbaggersupply.com — email is the fastest way to reach us — and we'll confirm before you order. You can also call 916-626-9030 (Mon–Fri, 9 AM–5 PM PT).

CALIFORNIA NOTICE

Race use only — not legal for use in California. S&S Cycle publishes no CARB Executive Order for this part, and S&S marks it "NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE." It is not legal for use on pollution-controlled vehicles operated on public streets or highways in California, and we cannot ship it to a California address — orders shipping to California will be cancelled and refunded. Available for shipment to the other 49 states.

SPECIFICATIONS

• Manufacturer: S&S Cycle — part number 310-1451
• Cam: S&S HPT542, chain drive — .542 in. valve lift, 223° intake / 259° exhaust duration, strong pull from 2,000–6,200 RPM
• HPT542 works with compression up to 11.7:1; aggressive but streetable idle lope (S&S)
• Kit drive: chain drive with S&S high-performance cam chain tensioner included
• Cooling: oil-cooled engines; pushrod tubes: black
• Oil pump/cam plate: precision machined from billet aluminum; independent scavenge sections for flywheel cavity and cam chest
• 44% flow increase on the supply side and 58% flow increase on scavenge vs. stock (S&S figure for the pump/plate)
• Debris screens in both scavenge pickups; magnet in the cam chest helps stop debris from entering the oil pump
• Pressure relief valve is adjustable with the unit installed in the engine; passage plugs removable for servicing
• S&S Precision Tappets — hand assembled to exacting tolerances, close tolerances for low leak-down rates, fast pump-up
• S&S Quickee adjustable pushrods included
• Includes all gaskets, bearings, and hardware required for installation
• Made in the USA

INSTALLATION

This is a full cam chest build: the kit replaces the cam plate, oil pump, cam, tappets, and pushrods. Follow the S&S instruction sheet included in the box and the torque specs and timing procedure in your Harley-Davidson service manual. S&S publishes an official install video for its cam chest kits — it is embedded below. Professional installation is recommended; if you'd rather not do it yourself, email us and we can refer you to one of our install partners.

QUESTIONS RIDERS ASK

What's in the box?
The HPT542 cam, S&S billet cam plate and oil pump, Precision tappets, tappet cuffs, Quickee adjustable pushrods with black tubes, the cam chain tensioner, and all gaskets, bearings, and hardware for the install.

Is the HPT542 a bolt-in cam?
On 2024-up Gen 2 engines, yes — it's designed for the oval-port 117/121 non-VVT motors and works with the stock valvetrain layout in this kit. In a 2017–2023 Gen 1 engine it needs S&S .605 in. lift valve springs.

Can you ship this to California?
No. This is a race-use-only part that does not conform to CARB standards, so we do not ship it to California — see the California Notice above. It is available to the other 49 states.