Rochester Quadra-Jet Carb ?

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breastman569

Member
The carburetor number is 17057292 and it is a model 4MC,4MV does anyone have this carb? I guess when im asking is that mine is soaking right now and if it is to far gone is there another replacement that i could pick up on ebay that i wouldn't have to retro fit? Will any 4barrel carb work as long as it fits a chevy small block? Any help or guidence would help.

Ryan
 
More than likely, your carb can be matched easily with just about any Q-jet or for that matter any spread bore carb. Numbers don't mean anything to me. Maybe someone else can help there but IMO just about any Q-jet will work, you may have to change the jets/ needle valves to tune it in depending on what application your new carb came from. And the spring tention on the secondaries may need to be tweaked on to control how fast the secondaries open. Hope this helps. Actually, none of the later model electronically metered carbs will work nor will the early models but there aren't many of those around anyway.
 
breastman569 said:
The carburetor number is 17057292 and it is a model 4MC,4MV does anyone have this carb? I guess when im asking is that mine is soaking right now and if it is to far gone is there another replacement that i could pick up on ebay that i wouldn't have to retro fit? Will any 4barrel carb work as long as it fits a chevy small block? Any help or guidence would help.

Ryan
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I had a similar situation many years ago. Was relieved to find that a Holly Carb will work just as well if not better than a Quadra-Slush. I'm sorry that I can't give you more info than that, since, as I said it was many years ago and I just don't have the carb or any of the paperwork anymore... but it's not a hard conversion
 
Breastman

I have a Quad 4 barrell on my 350 chevy inbd on my V 20. Check to see if the throttle linkage bushing are wore out. If so then get a another carb, you can rebuild any carb unless the throttle linkage bushing areas are not sloppy. They will suck air and you will never get the carb to idle right.

I'll get you my numbers off mine but my numbers are VOLVO Penta numbers and may not mean anything. I was looking on replacing my distributor with a new one and I found out the numbers on it were Volvo Penta but I couldn't cross them over. I just went and looked for a 1991 350 distrib.

If you decide to replace cross check your carb number to see if it is a 350/400/600 cfm carb and then just get 1 for a chevy. Spareparts and Them can probably help you out figuring what those numbers correspond to cfm size.
 
all the Qjets are 750 cfm except for a few that were used on BOP engines, they usually have the fuel inlet going straight in. You can get a holley carb to replace the q-jet, but in my opinion, they aren't as refined as a q-jet. If the bowl area in your carb is corroded, reaplce the carb, you can still get new one(made by carter) and several companies(Sierra) offer remans(check with ebasicpower.com), but they ae not cheap, if you replace it with a holley, make sure to get the specific q-jet replacement as its a spread bore design. IF your throttel shafts are worn, "the carb shop" offers a bushing repair kit complete with reamer, you can get it thru Summit( i have one and it works great). I'm all the time picking up good used q-jets to play with for cheap, but marine ones(different internal metering) are hard to find due to corrosion.
 
mine too is a volvo penta which i do believe is a small block chevy so really any distributor for a chevy, but please correct me if im wrong.
 
you have to watch it when swapping for a Merc carb, they usually doan't have any linkage below the throttle plate, Most of the rest of teh marinizers used a carb that had soem linkage below the throttle plate, when you swap them to a merc, on some applications it will hit the manifold
 
spareparts said:
all the Qjets are 750 cfm except for a few that were used on BOP engines,
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that must only be in marine apps they made tons of different CFM in Quads. i have a shelf full of quads where i took them off cars and trucks they range from 500 to 1100 cfm sizes.
 
I think you are right about sizes in the Q-Jets Skools. To ensure a good match I would say to measure up the throttle plates and check out the bore of the carbs to make sure you are in the ballpark. Stick to one that matches in general demension and you can't go wrong. I bet any good carbureator shop will help you with numbers and if not they may have a affordable reman
 
measure the throttle plates, on the old style 4MV, they all had the same size primary plates, only the BOP(not all) ones had bigger secondary plates, at least thats what my Rochester book says
 
well the rebuild worked, i fired it up yesterday for the first time in 10years and i sounds better than my truck engine! i did find a small water leak in coming from the front sea water pump i think its called so i think i will change the front seal and she should be good to go.
 
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