Valve Guide Loose in Head - Options?

[ukkid35]

When I did a top end rebuild on my 928 some years ago, there was a requirement to use protective shields over the tops of the valves when installing the valve stem seals

Is that typical?

[ukkid35]

Thanks for all your advice, it is very much appreciated

[ukkid35]

Five Year Update

The car has done several trips to Germany each year, including 2020 and 2021, and although the car has suffered various issues, the top end has been great, no problems at all

That included July 2022 when I was at the hottest track day I've ever attended

Fitting cooler plugs has helped a lot, it's now much more difficult to provoke pinking which used to be a problem below 2200 with rapid throttle application under load

I think the engine has finally stopped trying to self-destruct