Not being as familiar with the Corvair as other 6 cyl engines I don't know what the "overfill" limit would be. What we always cautioned against happening with an overfill situation was the crankshaft getting completely covered with oil and then "beating" the oil like an egg beater and causing it to foam. I guess you could carefully add oil until this happened, and then drop back one quart to be sure it would not happen, doing the test with no load just static running. Or you could just add the extra 2 quarts and watch for this, which might be safer since William has tested the engine at this volume.
I do not want to claim to be all knowing about oils, especially with all the advancements in synthetics today, I just hate to see anyone get fooled by high oil pressure numbers in the cold, and in reality part of their engine is not getting proper lubrication due to lack of flow causing excessive wear or the potential for failure. All of us work too hard to get to completion, the builders that started from scratch especially! Colin crain...@cfl.rr.com http://kr-builder.org/Colin/index.html KR2(td) N96TA Sanford, FL Apex Lending, Inc. 407-323-6960 (p) 407-557-3260 (f) crai...@apexlending.com