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Fellow NCRS members. Please see the response I received from Wayne Loron in regards to 1961 T10 main case transmission, Cast Iron main case cut over to Aluminum main case.
Larry-
I don't have much new info to go on. Based on my documentation, 61 VIN 2676 had a cast iron maincase, so, yes, the Judging Manual should be updated. VIN 4892 had an aluminum maincase.
The earliest aluminum maincase I have seen was stamped WL2802 for November 28, 1960, which was also the St. Louis build date of your 61!
During November, December and January, the T-10 assembly dates and the St. Louis assembly dates differed by just a week or two, in one case, just six days.
It looks like your car was built right on the change-over. Since running changes were not always clean, your car could have had either maincase.
I have judged 58-62 Corvettes for 25 years, and I would say either maincase is okay, because nobody really knows for sure! That is my personal opinion, not the official NCRS position, or what other judges would say.
Regards, Wayne
Larry-
I don't have much new info to go on. Based on my documentation, 61 VIN 2676 had a cast iron maincase, so, yes, the Judging Manual should be updated. VIN 4892 had an aluminum maincase.
The earliest aluminum maincase I have seen was stamped WL2802 for November 28, 1960, which was also the St. Louis build date of your 61!
During November, December and January, the T-10 assembly dates and the St. Louis assembly dates differed by just a week or two, in one case, just six days.
It looks like your car was built right on the change-over. Since running changes were not always clean, your car could have had either maincase.
I have judged 58-62 Corvettes for 25 years, and I would say either maincase is okay, because nobody really knows for sure! That is my personal opinion, not the official NCRS position, or what other judges would say.
Regards, Wayne