A/ Inlet valve 1.5" racing SRM 215/1
B/Inlet alloy valve collar [2011 T6 alloy]
C/Exhaust alloy valve collar [2011 T6 alloy]
D/Exhaust valve SR 67-0967
E/Valve spring bottom cup SR 67-0886
F/Norton exhaust valve bottom cup, Bakelite insulator
Alloy head rockerboxs are different from the cast iron head type. They are relieved to allow clearance for the larger springs used on the alloy heads (see positions A). They are identifiable by the manual stamping of the part # on the underside (see B). I have lightened the rocker arms and polished them all over (see C). Mushroom head tappet adjusters with alloy nuts have also been fitted (see D). The rocker shaft springs have been replaced with solid washers to prevent excessive end float at high RPM. A rocker breather has been fitted (see Rocker Breathers page).
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