1. He continued to experiment with four valve heads right up to 1973. 2. Valve head diameter was enlarged and the valves were spaced further apart.3. In due course, a Weslake 8-valve head became available for the Triumph motor. 4. It is still an iron block with pushrods and an aluminum 2-valve head . 5. A three-cylinder engine, it displaces and features a SOHC 12-valve head . 6. All cylinder heads were two-valve heads that use large ports with poly-angle or'canted'valves. 7. The engine has a four-valve head with splayed rocker arms to actuate the valves. 8. The Chairman of SoVo is Timo Rannikko and Ismo Valve heads the Football Section. 9. The twin-cam four-valve head was replaced by the single-cam three-valve head , possibly from the Arab. 10. The 343 and the AMX 390 use the same larger valve heads , intake and exhaust.
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