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Since we’re taking our 396 0.030-inch oversize, each cylinder was bored 0.025-inch over and then honed the remaining 0.005 inch, using several steps with progressively finer stones.. This is called Plateau-honing. The cylinder diameter is measured with a bore gauge.
396ci Chevy Big Block - Engine-Building Tips

 Since we’re taking our 396 0.030-inch oversize, each cylinder was bored 0.025-inch over and then honed the remaining 0.005 inch, using several steps with progressively finer stones.. This is called Plateau-honing. The cylinder diameter is measured with a bore gauge.  View Related Article

 

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