The next step to rebuilding the blown CB450 engine was to refurbish the donor cylinder head. This head was taken from the later CB engine with a disintegrated piston, and needed to be carefully cleaned before we could reuse it.
Luckily, these engines have a pressed-in steel dome in the head, which forms the top of the combustion chamber, instead of a pair of hardened valve seats pressed into aluminum. If this had been an aluminum surface, the debris from the melting piston would have burned up and destroyed the inside of the head. Instead, the molten aluminum can be easily chipped off the steel dome.
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| Removing a stubborn bushing |
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| Preparing for grinding a cleaning |
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| Inserting the valve to check for deformity |
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| Attaching rubber fuel line to the valve stem, so I can grind the valve seat with a power drill |
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| Grinding the valve seat |
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| Refurbished cylinder head |
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| Reassembling the valve train |
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| Bolted back together and ready for the camshafts |
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