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... 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, connecting rod and camshaft bearings. Large capacity, positive filtration system incorporated. Connecting Rods. Steel beam section, with integral bolts stiffness with minimum reciprocating weight. Pistons. Diecast aluminium alloy. Two compression rings (chrome top ring), two scraper rings. Large diameter gudgeon pins, WU**^") /"^ ^ located by circlips. COOling Systems. Thermostatic control. Closed circuit layout incorporates centrifugal water pump and large capacity radiator with ample integral header tank. Ignition. High efficiency coil and distributor, with inbuilt automatic advance and retard. Distributor has " octane " selector, dashcon trolled. ensuring maximum Carburation. S.U. carburetters. Large twin variable Twin air cleaners. jet Fuel System. Tank capacity 17 Imperial gallons (77-23 litres—204 U.S. gallons). Twin, electric fuel pumps. Inbuilt reserve, electrically operated. (3 gallons—13-63 litres—3-6 U.S. gallons). Clutch. Large friction area single plate design, ...