Forged cast type rocker with original ratio of close to 1.3 with adjusting screw and 1/2"AF nut.
Particularly effective on small bore engines although standard fitment on "S" type engines.
Use recommended valve clearances.
Recommend: 8 x 12G1221 per Mini.
For the rocker adjusting screw, see AEG167
For the rocker adjusting screw nut, see NT605061