Among other cars, I have a '73 Triumph Stag with the engine apart. This
car ran on leaded fuel, so I'm wondering what, if anything, I should do
about the exhaust valves and seats. The reason there's some confusion,
is that they used the same part numbers for the exhaust valves and
seats on the TR7 engine which did use unleaded fuel. This brings up a
couple of questions:
1) Are these really the identical parts? BL didn't change the
physical composition and keep the same part number, did they?
If they are the same, does that mean they put hardened seats on the
Stag, or unhardened seats on the TR7?
2) How do they hold up in the '7? Anyone see any significant errosion?
I'd like to avoid replacing them, if possible. Anyone have any info?
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