Quote:
Originally Posted by John Stone
Took an engine apart the other day. Head looked clean and checked flat. Still had machining marks. Set it aside and after cleaning it up and painting yesterday noticed the counterbore was not consistent. Difference from the front to the back averages .035".
My take is that it should be replaced. Milling it to the point that everything is even will remove almost all the counterbore.
What do you guys think?
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Picture ? 'looked clean/checked flat'...
There is an 'idea'/process for taper milling (expensive) a head to achieve wanted combustion chamber performance (quench). Haven't seen this with a stock setup engine, but would work to improve c/r and wanted quench improvement shape. Maybe this is what you have here ? Be aware of your piston 'popup' , or not, setup before considering this idea/process.