[TR] Valve seats

[John Macartney <johnbmacartney@gmx.com>]

Does anyone out there have documentary evidence (in the form of Service 
Bulletins issued by the factory or Leona NJ) that makes specific mention of the 
introduction of stellite valve seats in place of earlier and softer 
alternatives? I do recall BMC making something of a hoo-haa about stellite 
seats being used in the MGB and Healey 3000 back in the sixties. Same applied 
to Rootes Group and Jaguar.
There is hearsay in the UK that hardened seats went into heads for the US 
market at about the same time because of the introduction of unleaded fuel. 
That hearsay also suggests hardened seats were territory specific but from an 
ease of production standpoint, having two different types of seat during 
machining and manufacture just doesnâ??t make sense. I can think of other 
examples where Standard-Triumph adopted a â??one type fits allâ?? applied and 
that goes for other British makes.
Itâ??s clear that valve seat recession fears in Europe has been a kneejerk 
reaction to a problem that never really existed which suggests stellite valve 
seats were fitted for all markets. An engineering or service bulletin back in 
the day would have confirmed this but I never remember seeing one. Thoughts 
anyone?

Jonmac
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