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... coolant. Sparking plugs 10 mm. centrally situated. VALVE OPERATION. Twin overhead camshafts with directattack valve actuation, eliminating tappet adjustment. Cams contact largearea thimble tappets directly over end of valve stems, ensuring minimum wear. Camshafts driven by duplex chain with hydraulic tensioners to prolong chain life. LUBRICATION SYSTEM, full pressure system to all crankshaft, con necting rod and camshaft bearings. Large capacity, positive filtration system incorporated. CONNECTING RODS. Steel beam section, with integral bolts, ensuring maximum stiffness with minimum reciprocating weight. PISTONS. Special diecast aluminium alloy. Two compression chrome top ring), two scraper rings. Large diameter gudgeon pins, located by circlips. COOLING SYSTEM. Thermostatic control. Closed circuit layout in corporates centrifugal water pump and large capacity tubular radiator. IGNITION. High efficiency coil and distributor, with inbuilt automatic advance and retard. Distributor also has "octane" selector. CARBURATION. Large twin variable jet S.U. carburetters. FUEL SYSTEM. Tank, 19 imperial gallons (86-37 litres]. Twin electric fuel pumps. Inbuilt reserve, electrically operated. CLUTCH. Large friction area single plate design, fully balanced. GEARBOX. column control, GEAR RATIOS. "David Brown" Synchromesh with four forward ...