| 11. | The twin-cam four-valve head was replaced by the single-cam three-valve head, possibly from the Arab.
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| 12. | The exhibited bike has an experimental larger valve head and a large aluminium crank pin.
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| 13. | The basic design is a revised 3VZ-E iron-block engine, mated with aluminum DOHC 24 valve heads.
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| 14. | The Sextet used a Continental side-valve six-cylinder, modified by National engineers with an overhead valve head.
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| 15. | The 2.4 litre engine gave rise to some massive power outputs using the 16 valve head.
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| 16. | Cosworth also produced a 16-valve head ( Cosworth Project DBA, 1987 ) for the Iron Duke.
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| 17. | Most often used is the valve head diameter.
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| 18. | It has aluminum four-valve heads, forged crankshaft, H-beam forged rods and aluminum pistons fed by a supercharger.
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| 19. | Various aftermarket manufacturers have also produced four-valve heads for the 302, notably Arao Engineering and Dominion Performance.
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| 20. | Later versions received a twelve-valve head, as installed in the JT150 Gemini it offered at 6, 000 rpm.
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