Before you do any boring, or order any parts, it is CRITICAL that you measure the cylinder.

You have to take three measurements in two directions each. Top, middle and bottom of the cylinder. Take each of those measurements twice, 90° from each other. This will tell you how much the cylinder is worn and where. The cylinder does not wear uniformly top to bottom.

You want to bore the cylinder JUST enough to get it back to straight, parallel walls.

That will determine how much you need to oversize.

Any good automotive machine shop will do the whole job for you for not much money if you leave it with them as a "fill in" job for a few days. Just explain what you want to do, and the range of over-sized parts available and they will determine the amount of bell-mouth to the cylinders and machine the block accordingly.

Best of luck.

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