Tweet
I'm curious to see if there are any differences(appearance wise) between all the different Q-Jets built during the 69 model year. I assume that from the outside they are all identical except for the part number and that the only differences are to do with internal settings and jet/metering rods etc. Am I correct with this or out to lunch? Thanks.
-
-
Re: Any Q-jet "experts"?
i would guess that all chevy ones would look the same except for the the ones with auto trans kick down linkage but one from other GM car lines had different throttle linkage arms. -
Re: Any Q-jet "experts"?
For the most part all Chevrolet automobile Q-jets looked alike in any given year. Some of the truck versions were fitted for governors, thus they looked different. The only thing I can really remember differing visually was some carbs had a cover over the bowl vent and some did not, even among those with the same application number. I don't know if this is a difference between the carbs manufactured by Carter vs Rochester, but it happens. Q-jets for other divisions not only had different throttle linkages but some had integral choke thermostats (Chevys all had "divorced" choke thermostats), and the fuel line connection was parallel to the center line of the carb, Chevys were at 90 degrees to the centerline. Internally you can find some really interesting differences, especially in the versions used on Olds 442 W-30's with manual transmissions. These carbs did not have a power piston and primary metering rods.
MikeComment
-
Re: Any Q-jet "experts"?
i think the upper bodies are the same with an exception of having the dist vac advance port there or not drilled. the really different part is the base plate. the throtle linkage is different in an auto vs a 4 speed. they all function the same but wont hook up. inside you are correct that the jets, metering rods, rod cam profile, power piston spring strength, etc are all diferent depending on what engine/fuel demand was needed. even if you find one that is the correct number, that doesnt mean its set up right. it will hook up correctly.Comment
-
Re: Any Q-jet "experts"?
Mike-----
All ORIGINAL Q-Jets used for 1969 Corvette applications did have the stamped steel fuel bowl vent cover. However, later SERVICE carburetors for the 1969 applications did not. They used a different venting system and there was no vent, at all, on the top of the air horn (although the casting remained with "vestiges" of the vent mechanism).
Still later, the air horn mounted vent and cover returned to SERVICE carburetors for the 1969 application.In Appreciation of John HinckleyComment
Comment