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I HAVE a 1982 ZJ Ford Fairlane fitted with the 4.1-litre alloy-headed six-cylinder engine. A cylinder-head specialist told me the alloy head was already fitted with hardened valve seats so I should use high-octane unleaded petrol and don't need an additive. Is that correct?

THE advice is basically correct. All alloy-head engines have valve inserts, but some are not hardened to the degree needed to survive the pounding when using unleaded fuel. But Falcons and Fairlanes have been running around for years on LPG without trouble, so they'll survive fine on unleaded. So, yes, run your Fairlane on PULP for the octane rating you need without adding a lubricant.