Bill, you have received some excellent advice. Let me throw a couple
things into the mix. Yes to "hot tank' for cleaning; Yes to
multi-angle valve grind; Yes to spring replacement; Yes to guides.
What I did not see mentioned in the replies was the most important
basic. Magnaflux. have the head magnafluxed adn also have it pressure
tested. Magnaflux shows onl surface cracks. Pressure test shows
internal crack. Raise compression to about 9.5. The higher burn temps
of today's fuel limits the compression on stock pistons, especially in
cast iron engines. We take the TR8 engine well past 9.5 but the
aluminum engine dissipates heat rapidly. Use the formula for
compression ratio
rather than how thick the head casting measures. Good luck. Please
letl me knwo if we can help. Ted
Bill Bereza wrote:
>Well, I've got a leaking exhaust valve on the #6 cylinder in my '74 TR6.
>My mechanic is going to be removing the head and will call me over when
>it's off and time for a diagnosis.
>
>At the very least I'll probably need a valve job, so I was wonder what else
>I should do to the head while it's off (in terms of simple performance
>enhancements.) I don't know if I would want to shave the head or get a
>fancy valve grind, but I think freeing up the flow in the exhaust might
>be worthwhile.
>
>So what else should I do while the head is off? (And assuming the problem
>with the valve is simple enough that I'll have some money left over for
>unnecessary work.) What kind of things should be done to make it better
>for unleaded gas? I've read about brass valve seats and such. Any other
>ideas?
>
>It might be nice to come up with a list of the Top 10 things to do to your
>head.
>
>Thanks all.
>
>Bill
>'74 TR6
>
>
>
--
Ted Schumacher
tedtsimx@bright.net
http://www.tsimportedautomotive.com
108 S. Jefferson St.
Pandora, Ohio, USA
Fax: 419.384.3272 (24 Hrs.)
Phone: 800.543.6648 (US & Canada)
Tech/ Gen. Information/ Worldwide: 419.384.3022
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