S&S Cycle Forged Roller Rocker Arm Set — 1.625:1 — Twin Cam / Big Twin

S&S's forged roller rocker arms in the stock 1.625:1 ratio for Big Twins — the strength and roller tips high-lift cams need, with metered oiling and a case-carburized wear surface for long life.

FITMENT

S&S fitment: 1999–2017 Harley-Davidson Big Twin models. In our 2014+ Touring catalog: 2014–2016 Twin Cam Touring models.

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).

SPECIFICATIONS

• Manufacturer: S&S Cycle — part number 900-4065A
• Forged roller rocker arm set — 2 front & 2 rear; stock 1.625:1 ratio
• 8620 steel with metered oiling; case-carburized hard surface for longer life (S&S)
• S&S roller rocker arms are recommended for cams with more than .585 in. of lift (S&S)
• Adjustable pushrods must be used with S&S roller rocker arms to obtain proper valve clearance (S&S)
• Made in the USA

INSTALLATION

Rocker arm replacement is top-end work. S&S is explicit: adjustable pushrods must be used with S&S roller rocker arms to obtain proper valve clearance. Follow the S&S instruction sheet included in the box and your Harley-Davidson service manual. No official S&S install video is published for this part — installation is manual-only. Professional installation is recommended; email us for an install-partner referral.

QUESTIONS RIDERS ASK

Why roller rockers on a Twin Cam?
Roller tips cut the side thrust that wears valve guides, and the forged 8620 arms take the loads of high-lift cams that S&S rates these for — cams over .585 in. of lift.

Do I need anything else?
Adjustable pushrods are mandatory with S&S roller rockers to set valve clearance (S&S), and S&S recommends new rocker arm shafts for maximum performance and rocker life.

1.625 or 1.725?
1.625:1 is the stock ratio — this set. The 1.725:1 set (900-4098A) adds lift at the valve but S&S recommends it for racing only.