Big block oil pump identity-------Joe Lucia?

[George W.]

Casting on this pump ie 3860376, believed to be from a high HP '67 427.
Anyone?
Thanks,
George

Oh, this late 351 block had an original oil pan that had the sump extended. I thought it was just another "Bubba" job, but then saw a photo of what GM did with some special racing application engine pans, and am now wondering.

[Joe L.]

Re: Big block oil pump identity-------Joe Lucia?

George-----

The casting number is correct for 1965-66 big block oil pumps. It may also have been used for 1967 and later; I'm not sure on this at the moment. It's usually impossible to identify a SPECIFIC application oil pump from a casting number, though, since the same casting is usually used for several finished part number oil pumps.

GM did once sell an extended sump oil pan. However, this was an over-the-counter only piece. It was never used on a PRODUCTION application. It used a standard Corvette big block pan as a "core" and added a "sump extender" section. Many aftermarket pans do the same thing. In fact, the GM piece was probably manufactured for GM by one of the same companies that do it in the aftermarket. An extremely low-volume piece like these extended sump oil pans would be extremely unlikely to have been produced by GM in-house.