With the head of look around the exhaust valve seats the smaller diameter ones. Clean down to the metal surface use a small bronze brush and you’ll see the hardened valve seat insert as a ring of different coloured metal around the edge of the valve. Or, if the head looks to be the same metal right up to the valve, it’s not been converted.
Does it need doing petrol additives are available, but and engineered solution would be our preferred route. If a standard head is run on unleaded, valve seat recession develops gradually exhaust valve were into the metal of the head, causing loss of performance and possible damage to the head.
Deal with the other issues, get the vehicle on the road and drive it gently, remembering that if the engine doesn’t pull well there may already be valve seat damage that would allow loss of compression.
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