Water Pump Date
What would be a correct water pump date range for a 66 427 ? Vin pad has a date of T0207IL. GM #3856284 would be an applicable pump. Does rear pan has pan head screws or oil pan bolts? Not really sure how a judge could see the pump numbers though.
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Re: Water Pump Date
Paul------
NCRS-correct would have the pump dated within 6 months prior to engine build. In your case, the engine was assembled on February 7 and assuming the engine is original, that would have to have been in the year 1966. So, a waterpump dated between about August 7, 1965 and February 7, 1966 would be considered correctly dated.
As far as the rear screws go, attached are photos of an NOS GM #3876173 waterpump assembly (casting 3856284)[not for sale]. This pump body has casting date of K-22-66 (November 22, 1966). So, if this pump had been installed in PRODUCTION it would have been on an early to mid production 1967. Nevertheless, it's clearly evident that this pump has the slotted rear cover screws. Since these were the first type of fasteners used for big block waterpumps, your earlier pump would have had to have been the same.
DSCN3956.jpgDSCN3957.jpgDSCN3959.jpgDSCN3958.jpgLast edited by Joe L.; December 3, 2021, 01:34 AM.In Appreciation of John Hinckley -
Re: Water Pump Date
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