11. There were also problems with exhaust valves and valve guides on the engine. 12. The engine's governor regulates by suspending the action of the exhaust valves consecutively. 13. Another reason is the large tappet clearance on the exhaust valve . 14. The Algol had a single pair of overhead inlet and exhaust valves per cylinder. 15. The cylinders had cast-iron liners and the steam and exhaust valve seatings were renewable. 16. The intake and exhaust valves were located at the top of each combustion chamber. 17. The L76 / L92 / LS3 cylinder heads use intake valves, and exhaust valves . 18. Both inlet and exhaust valves were in the cylinder heads. 19. Its intake valves were nearer the intake manifold, exhaust valves nearer the exhaust pipes. 20. The two exhaust valves enabled the motorcycle to be fitted with two separate silencers.