Rochester Quadra-Jet Carb ?

[garagenc]

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.

[spareparts]

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.

[Skools Out]

Originally Posted by spareparts

all the Qjets are 750 cfm except for a few that were used on BOP engines,

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.

[RidgeRunner]

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

[spareparts]

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

[breastman569]

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.

[breastman569]

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.

[spareparts]

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