Michael,
Here's some info:
Early TR4 head 1.297 x .3750 stem x 4.406 length
Later TR4 1.297 x .313 x 4.406
Early 6 1.25 x .313 x 4.609
Late 6 1.193 x .313 x 4.598
Hope this helps.
Peter C
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At 11:41 PM 1/8/2001, Michael D. Porter wrote:
>... but I don't, and can't find the difference in the factory TR4
>manual, and don't have a TR6 manual handy. What's the difference between
>early TR4 and later TR4/TR4A exhaust valves, and early and late TR6
>exhaust valves? Reason I ask is that Vicky Brit has Stellite exhaust
>valves on sale, and I'd like, in each case, to pick up the larger of
>each type. Seat and guide differences are not an issue--I can press in
>the right guide and machine the valve seats as necessary.
>
>Cheers, all.
>
>--
>
>Michael D. Porter
>Roswell, NM
>[mailto: mporter@zianet.com]
>
>`70 GT6+ (being refurbished, slowly)
>`71 GT6 Mk. III (organ donor)
>`72 GT6 Mk. III (daily driver)
>`64 TR4 (awaiting intensive care)
>`80 TR7 (3.8 liter Buick-powered)
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