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