I have measured the bores in my /6 for size and roundness, high in the bore and lower. Came up with a big bore diameter of 3.4060" and a small bore of 3.4010" I'm hoping to hone the cylinders and use stock size rings. Any comments, suggestions. Are these acceptable tolerances?

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Street rod an old car and then drive/use it. I'm a NSRA safety inspector if anyone ever wants that done to their car.

My '64 FSM lists the max allowable out-of-round as 0.005" and max allowable taper as 0.010". I think you're good to go.

If you see that full variation at one height in a single bore then you're right up against the out of round limit, but even then I wouldn't sweat it for a stock-ish engine.

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

Vote #2 to re-ring / overhaul the engine & run it.
To be honest, I have successfully re-ringed SL6 engines with even more wear, with good results.
DD

I agree.

Lou

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Home of Slant6-powered fun machines since 1988