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.

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