17054907 PMR length

[jagness]

I'm kind of confused by the number of this carb: 17054907. I was told that it's a service replacement carb, but how can you tell that from the number? The julian date code is 0375. Does that mean it was built in '75 for an earlier vehicle? Also, should it get the later, shorter primary metering rods?

[Kenth]

17054907   is a Delco/Rochester Service Replacement Quadrajet for 1971 Pontiac 400-455 M/T&A/T and has #71 primary jets, #44 primary rods, BU secondary rods, 7/16 turn on airvalve preload spring and uses a #7037305 power piston spring.

[jagness]

Thanks. How do you find all that info? And does it use the later, shorter primary metering rods?

[Kenth]

This info is from the Delco Parts & Service Manual #9 (The Big Book).
The shorter primary rods came with 1975 and later "Modified" Quadrajets, the M4MC-style.

[jagness]

But it was built in ‘75.

[Kenth]

Yes, the Service Replacement units were always made later than production carburetors.
Since it was made for 1971 engines it has 1971 specifications.

HTH

[Cliff Ruggles]

Yes it was built in 1975.

No it doesn't take the later primary metering rods.

Since it was built as a direct replacement for a 1971 Pontiac Q-jet it will use the same rebuild parts and same length early style primary metering rods.

If you need anything for it call me at the shop.  I am familiar with what is used in it and what it needs to have in it if being used outside of the original application it was built for.......Cliff

[jagness]

Okay, thanks to both of you. Cliff, I'll try to call later today or tomorrow.