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Seating comfortably

I am thinking about buying a ‘classic’ Aston Martin DB6. Will the valve seats be suitable for running on superunleaded petrol?

Asked on 22 May 2010 by G.R., via e-mail

Answered by Honest John
Motoring Correspondent Andrew English (who races a DB5) writes: “Most valve seats are made of a colbalt chromium steel alloy known as Stellite, which is tough rather than brittle and has excellent wear
properties. They are press fitted, screwed or stitched into place. The Aston has such valve seats in its aluminium cylinder head and the recession is negligible, which is just as well as the valves have to be machined to set the clearances.”
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