Thread: Oversize lifter, or center grind lifter to correct size?

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The offending lifter bore. Red line points to barely visible stamping on the outside of the bore. Nobody seems to know if it's a "C" or an incomplete "O". Man is that garage a dump. It's my fault, too

Note the circular thingee in the center of the head where the heat exchange passage should be. It's a sealed socket head cap screw. If I unscrew it, which I will, the hot air passage in my manifold becomes a coolant crossover. TA spent some time on the design of these heads, really quality pieces