| 21. | It had an iron block and aluminium cylinder head with no bore liners.
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| 22. | Hydraulic tappets require more complex and more expensive cylinder head design.
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| 23. | The block houses the pistons, while the cylinder head houses the valve train.
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| 24. | The cylinder head was a compact design with round intake and exhaust ports.
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| 25. | The aluminum DOHC cylinder heads are 4 valves per cylinder designs.
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| 26. | GM used cast aluminum cylinder heads featuring 4 valves per cylinder.
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| 27. | The engine block and cylinder head were cast in one unit.
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| 28. | As long as his cylinder heads are NASCAR-approved, it will be a trend.
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| 29. | The crankcases, cylinder heads, and pistons were all of aluminium alloy.
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| 30. | Modern engines have cylinder heads made of either iron or aluminum.
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