General Category > Quadrajet Carb Talk and Tips

Carb Choice

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blazer74:
Hello Quadrajet people, newbe here.  Made it thru security. Here's what I have. Application 1974 K5 Blazer 4x4,  Engine 355, Performer intake, Headers and dual exhaust, cam 214 duration @50, 2000 stall, 4:10 gears, 35" tires, 4500 lbs.   Have 2 carbs on hand other than whats on the truck,  First  17085213 single main air bleed and 17056228 large main air bleeds.    Which one to build. I believe Cliff Likes the later single main air bleed carbs. The 17085213 has .038 idle tubes, the channel restrictions have been drilled to .070 prior to me obtaining the carb. Main air bleeds are .082, .055 bypass air, upper idle bleeds .068, lower .076, had 61s rods and 75 jets, EK 2nd rods.  Other carb 17056228  .032 idle tubes, channels are at .055, large main air bleeds .120 both, bypass air .080, upper idle bleeds .070 lower .076, had 48k rods and 77 jets with DP 2nd rods. Which would be prefered to build. I'm looking at recipe #2. Will be changing  to a 218@ 50 Cam soon from 214@ 50. Also does Cliff's recommended float level of 1/4 also apply to a 4x4. The single air bleed carb using his recipes is that using a .035 tip rod or .026 tip, and last question is the baffle used on some carbs that is attached to the center screws do anything.
I have Cliff,s book and is great. I thought I knew something about these quadrajets untill I read his book, Dang.                                  Thanks Craig

blazer74:
Make that .086 main air bleeds on the 17085213 not .082. (typo)


Craig

omaha:
Either carb could be made to work. I dont know, maybe the 1708XXXX carb would be a slightly better choice, but dont go on my recommendations on this one as I am just going on my gut instinct. Makeing a carb wotk on a 4x4 has some little quirks that may make a difference that I might not be aware of. (as far a carb choice goes). Which one has less warpage???  (this may be more of a factor than a number for the unit). If you do a search on here, you can find good 4x4 carb mod info.  1/4 float level is good for the 4x4 along with some other mods that will help control fuel slosh and venting etc. (all on the search function)....(I cant remember it all but if you cant find it, im sure we can help you on this forum as this is a subjrct that comes up frequently). Not sure 100% about the baffle but I think it may not be needed if you do a few other mods to the carb for 4x4 application. All in all, a Q-Jet makes an EXCELLENT choice for a 4x4 carb. Maybe the best choice due to its design. I'm sure others will chime in on this, How 'bout it guys?

Cliff Ruggles:
For serious off roading, we will block all external venting in the airhorn (except the 3/8 tube) and use a taller front vent.  The POE well vents should be made internal.

Really doesn't matter what carb you start with, use the one in the best shape, and having the features that you need, linkage, fuel inlet location, type of choke, etc.

End result is pretty much the same.  We can supply the needed parts to set the carb up for the application, and upgrade it for this new fuel...thanks...Cliff

blazer74:
No serious off road stuff, mostly cruising (full convertable blazer).
Going to use the 17085213 singe main air bleed carb. Cleaner looking carb, about the same for warpage.  recipe #2, will try 50m rods and 74 jets to start with. Not sure about the 2ndary rods, have a number of sets to try.
Will call for parts soon.   Thanks Craig

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