Triumph Spitfire Camshaft & Distributor Drive
Camshaft Bearings & Cylinder Blocks Original Block Specification Mk1 camshafts ran directly in the cylinder block, as did early Mk2’s up to engine number FC61022. Cylinder blocks for Mk2’s (from FC61023), all Mk3’s and early MkIV’s (to FH25000E), had enlarged drillings in the cylinder block to accept replaceable camshaft bearings (part No RL1495), though the camshaft journals remained the same diameter. Late MkIV (from FH25001E) and all 1500’s had revised cylinder blocks allowing the camshaft to run directly in the block without the use of bearings.