Skylarking
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As a general rule, scratches cause stress risers. Whether that is an issue within the combustion chamber I don’t know but as a precautionary rule I wouldn’t use a wire to scratch at things inside the cylinder. By all means look for broken bits especially small bits between the piston and cylinder wall junction, then retrieve what you find. You can use a magnet, small hose and vacuum, whatever works.
As for checking valves, it’s the valve seat that one needs a good look at as even small impact damage could allow a gas leaks which will quickly burn a hole in the seat and/or the valve itself. You can check the intake valves relatively easily since you’ve taken the intake manifold off. However checking exhaust valves I’d think would be a challenge due to space issues. Ideally you will want to take off exhaust manifold with cat converter to check for rubbish inside the exhaust system. Supposedly cats will catch such rubbish and on cars with cats near exhaust Such rubbish can be sucked back into the engine (according to GM service advisory). It’s a pain to do but maybe a good precaution are step that should also allow you to look at the exhaust valve seat through the exhaust posts... This thread talks of removing the exhaust manifold.
Good luck with it all...
PS: thought I had already posted to their thread but must have not pressed post reply before getting on to other things... problem when you’ve got to many tabs and windows open..
As for checking valves, it’s the valve seat that one needs a good look at as even small impact damage could allow a gas leaks which will quickly burn a hole in the seat and/or the valve itself. You can check the intake valves relatively easily since you’ve taken the intake manifold off. However checking exhaust valves I’d think would be a challenge due to space issues. Ideally you will want to take off exhaust manifold with cat converter to check for rubbish inside the exhaust system. Supposedly cats will catch such rubbish and on cars with cats near exhaust Such rubbish can be sucked back into the engine (according to GM service advisory). It’s a pain to do but maybe a good precaution are step that should also allow you to look at the exhaust valve seat through the exhaust posts... This thread talks of removing the exhaust manifold.
Good luck with it all...
PS: thought I had already posted to their thread but must have not pressed post reply before getting on to other things... problem when you’ve got to many tabs and windows open..