Rolls-Royce 20/25: S series

Notes on S series 20/25

S series chassis have chassis prefixed GNS, GOS and GPS.

New features intoduced on S-series cars
The design of the cylinder head valve guides was altered. Grooves were introduced in the face of the road springs leaves for lubricant transfer.
From GOS22 a friction damper was added to the brake servo, to restrict the speed of application of the front brakes. The brake servo linings were fixed with staples rather than rivets.

View the Chassis Numbers for the Rolls-Royce 20/25: S series