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I direct your attention to the "Wear Tolerances" table on page 0:7 of the
1972 140 series manual or other manual that applies to the B20. Says
bore when wear gets to 0.25mm/0.010" IF oil consumption is excessive.
Maybe we have better honing machines here but I went to 3.505" on the Yellow
Peril's block and got no complaints from the shop. Compression is very good
and in the first 5000 miles (after the 350 or so breakin) it used less than half a quart of oil.
--
George Downs Bartlesville, Heart of the USA!
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