Join Date: Jan 2002
Location: Calgary, Canada
Actually the pump casting number is 7801149 on the back cast plate. There is also a cast Julian date on the back plate, Very small hard to read. As stingr 69 mentioned there is a date on the little half moon pad . The way to read these are as follows- Example 06491S , which translates to 064th day, 9 means 1969, and the 1 means chevrolet division and the S is Saginaw Michigan. The first 3 numbers are the Julian day date and the 4th number is the year, the 5 number is the model division number and the last letter is the plant where the pump was built. The pump housing also has a cast date under the front plastic fan ( which should be white in 69 ) so you can tell if the pump is a restamp or not. Diverter valve numbers are 7029295 for Small blocks and 7029297 for 396/427. Anti backfire valves are 5361992 and the diverter extension is 3942533. The extension also has a little tiangle with the word Atlas in the triangle. There is also a single number after the atlas insignia which also designates the year the extension was cast, a 9 should appear on a 69 system unless it is a Dec or earlier car. Hope this helps. The left side air hose is a ribbed hose with the ink lettering 3932476 GM RC KV on it. Rite side hose has 3932478 on it. Hope this helps.
2002 Jerry Bickle Cavalier, 446" Small Block, Brodix Canted Valve, lenco 5 speed, 7.54 @ 180. mph,1.06 60', 2235 lbs for 2014. GM Canada Docs, Highly Optioned 69 RSZ28 , Hugger Orange, White Stripes, 42,000 mile survivor, owned since 1973.