I have a 71 GS455 stage1 with qjet# 7041242. When I purchased the car, the previous owner told me that the carb was a service replacement unit. When looking at the stampings on the body, it does not look the same as every other qjet I have seen. This one has one dot stamped on each side of the casting number. It also has '2049' stamped directly below the casting #. Did GM stamp service replacements differently?
Yes. In almost all cases the SR's do not have a Plant Code after the part number, and later Julian date than the model year. Later SR's will have 170549XX numbers instead of the same factory part number. For example, the 1973-74 Pontiac Super Duty carbs, part numbers 7043270/7043273 and 7044270/7044273 were SR'd with 17054910/17054911's. The SR's were also used to cover several applications. For example, they never made any Pontiac Ram Air carburetors in SR's for the manual transmission models. They used auto numbers instead. A 7029273 was SR'd with 7029270. Most of the early Firebird units were SR's with 7028276, etc. This makes the original manual transmission carburetors extemely rare, and the prices for them are off the scale, IF you can find one?.....Cliff PS: you can ALWAYS fine one on E-Bay, nicely "restamped" exactly for your application!
