| 31. | Both had increased power from updated cylinder heads and two-barrel carburetors.
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| 32. | In 1967, the cylinder head design was improved for all engines.
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| 33. | The 335 series engines used one of two different cylinder heads.
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| 34. | It has an aluminum engine block and aluminum DOHC cylinder heads.
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| 35. | Sodium silicate is suspended in the coolant until it reaches the cylinder head.
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| 36. | New hydraulic valve adjusters and twin plug cylinder heads were used.
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| 37. | The series has cast iron engine blocks and alloy cylinder heads.
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| 38. | The ER series has aluminium engine blocks and aluminium cylinder heads.
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| 39. | Other than that, everything has to be changed to accommodate the new cylinder head.
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| 40. | The next day he's selling cylinder heads for a living.
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