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cbyard · Sep 11th, 2003, 13:36

Super unleaded with lead replacement additive or ordinary with octane booster lead replacement is normal perceived wisdom. Long term solution is modified cylinder head but if car only sees light use you may well never need this. In any case, even if you wreck the head with unleaded, fixing it is only the same job as modifying it in the first place!

There was an interesting report on fuel catalysts in Practical Classics a year or so back which effectively rubbished them as having any effect on valve seat recession on a new "leaded only" cylinder head, but did show that at least some of the additives were effective.

Best wishes

Chris

Sep 11th, 2003, 13:36	#3
cbyard TDC Member ;-) Last Online: Jun 13th, 2020 19:08 Join Date: Jan 1970 Location: Witney	RE: 164 Leaded/Unleaded Fuel Super unleaded with lead replacement additive or ordinary with octane booster lead replacement is normal perceived wisdom. Long term solution is modified cylinder head but if car only sees light use you may well never need this. In any case, even if you wreck the head with unleaded, fixing it is only the same job as modifying it in the first place! There was an interesting report on fuel catalysts in Practical Classics a year or so back which effectively rubbished them as having any effect on valve seat recession on a new "leaded only" cylinder head, but did show that at least some of the additives were effective. Best wishes Chris