1972 350 Chevrolet Pickup Engine - Tech - Build Your First Engine
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With the oil-fouling mystery solved, the teardown continued. The cylinder bores measured 4.030 diameter, 0.030 over the standard 350 bore diameter of 4.00. There was minor wear, with no ring ridge present, and hone marks from the last rebuild were still visible. We may be able to get away with a simple hone job to restore the bore finish. If you find even the slightest ridge, the block should be overbored to correct the wear and allow positive ring seal and piston fit. On most 350s you can safely go 0.060 inch over. Anything more is a gamble unless you sonic-check the block and confirm a wall thickness of at least 0.180 inch on the major thrust side of all cylinders after the block has been bored to its finished size. View Related Article
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