Quadrajet Problem Solving > Quadrajet Parts and Numbers

Olds Q-jet?

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Ethan1:

--- Quote from: Cliff Ruggles on July 21, 2015, 04:34:38 AM ---The part number looks like a Service Replacement to me, as most of the 170549XX carbs were SR's. 

It may be for the Old's 455 Marine, no way to tell without seeing it.

Setting it up is still the same as any other q-jet, everything must be set-up exactly for the application.  If you lost control of idle fuel, make sure it has no "nozzle-drip" before proceeding.  It shouldn't, as the XE262 is a "tiny" cam even in a 355 engine build.  .070" jets and 50C rods would be pretty lean right off idle, and may be the root of your problems.

I have come to absolutely HATE those cams, not enough seat timing and LSA too tight.  They produce a "quirky" idle and nothing impressive for power production anyplace........Cliff

--- End quote ---

 Could be, Cliff. I didn't find any reference for it being a SR, but of course, that doesn't mean anything. You know what you are talking about, so I will go with you. Unless this person posts a couple of photos of it. :)

Cliff Ruggles:
Most of the 170529XX carb numbers will be Service Replacement.  We see a lot of those sent here for rebuilding, and not all the numbers are listed in our references......Cliff

MG60:
Hi Cliff , on the front cover of your (How to rebuild and modify Rochester Quadrajet carburettors) book that I bought is a early 1970's (704 series) carb ; exactly what is it ?
Thanks , Tim .

MG60:
I got it !  The carb is a 7029273 .   1969 Ram Air IV  400 "Judge"  for manual transmission .

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