Quote:
Originally Posted by supereal
We used to bore blocks for our race cars, and kept increasing the size until we found a block that wouldn't blow a sand hole. That was many years ago when more blocks could be had from the local "junk yard". The "enbloc" sand casting process used by Ford resulted in a very high rejection rate at the factory due to "core shift" during casting. Minor defects could sometimes be repaired by sleeving, but this defeated the original aim of all cylinders being equal. At our shop we do lots of boring, but haven't found a reliable test for cylinder wall thickness in old blocks.
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Yes, "reliable" is the key word here. You can sonic test a cylinder in 50 places and still miss a sand hole or core shift flaw.
Eventually, vintage racing will die or they will have to let after market blocks in.