41. Five valve designs ( with three inlet and two exhaust valves ) are also in use. 42. The intake valve was 40 41 mm and exhaust valves were 33 mm or 34 mm. 43. Intake and exhaust valves are also increased in size along with other changes to the cylinder head. 44. The exhaust valve linkage required frequent adjustment. 45. The exhaust valves on NHRA Top Fuel and Funny Car drag racing engines are made of Inconel. 46. VCT allows the timing of the intake and exhaust valves to be adjusted independently of each other. 47. For the seventh series exhaust valves with floating seats were introduced and the reduction gearing was improved. 48. Exhaust valves were sodium-filled to aid cooling.49. The engine is an aluminium alloy block and head with sodium filled exhaust valves to avoid overheating. 50. The exhaust valves also burnt through.
