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Chevy 3.1L/191 Cam Bearing Bores

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Some of the later roller cam 3.1L blocks for the ’93-’94 Chevy VIN M are showing up with oversize cam bearing bores that appear to have been caused by spun cam bearings. If a new cam bearing is installed in a bore that has been damaged, it will spin in the block, cut off the oil to the cam, and cause an immediate failure.

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Inspect the cam bores in all of the late 3.1L castings (10137093/ 10191737/ 24504089/ 24504150/ 10224227) very carefully, paying special attention to the #2 bore that seems to be the most prone to failure. If the cam bore is oversize, there are only two choices: 1) You can either knurl the O.D. of the cam bearing to get enough press fit, or 2) you can junk the block.

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