Norton twin cylinder head overhaul kit pre c1962+: inlet valves x 4; exhaust valve x 4; valve springs (pairs) x 4; cast iron valve guide x 4; heat insulation washers x 4. All the parts required to overhaul a worn but undamaged cylinder head for all twins pre 1962. Don't forget to add NEW valve collets if you need them SEE BT-D12/149 (R-067507 / MA-T8A) Original part number: V26; D12/142; T2010 - inlet valves x 2 [ Head Diam: 1-5/16 in 1.3125 in 33.3mm;] V27; D12/143; T2204 - exhaust valves x 2 [Head Diam: 1-5/16 in 1.3125 in 33.3mm;] 22839, 22838; 067070; 06-7070 - valve spring set x 1 valve guides x 4 heat insulation washers x 4
