Carburetor for 273

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66fs said:
71 was still good compression, the TQ just works and it still passed emissions, that is why it lived on to the end. It is also adaptable to use on a very wide range of engine sizes.
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I know Steve Dulchich loves them also.
 
IIRC Carter 4-barrels are NOT flow-rated the same as Holleys, which makes them smaller than they say the are. Which is why a big 850 TQ works on a 318, cuz it ain't an 850 in the first place.
I mean, IIRC.
 
AJ/FormS said:
IIRC Carter 4-barrels are NOT flow-rated the same as Holleys, which makes them smaller than they say the are. Which is why a big 850 TQ works on a 318, cuz it ain't an 850 in the first place.
I mean, IIRC.
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it works because it has tiny primaries and vacuum operated secondaries.
 
Pontiac used a QJ on a 230 cu in line 6 in 1967.

An 850 TQ isn't an 850? How about 900+ cfm....according to Steve Dulcich

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It doesn't matter how many cfm a carb has the potential to pass, it ain't a supercharger, and the engine under it can rarely ever flow more than it's own cubic inches, until it is highly modified.
Therefore, on the street, so long as the carb is at least big enough, bigger is rarely better.
And on that note, I have firsthand experience with a little Carter 2bbl on a 340, that ran like the proverbial scalded cat.
On my little 367, now with a modest 230* cam, I have since 1999, run the following carbs; an AVS, an AFB, A big Thermoquad, a 600VS, a 730VS and the 750DP
I like the 750 DP for one reason, I can slam the pedal down at very low rpm, have all 4 bbls open, and not have a bog or a stall.
I mean, I install TQs on 318s all the time. and they sound faster. But they're not much if at all, any faster than a 2bbl, at least not until she gets up on the cam, and then it's all over, cuz the cam and head combo, has the powerband of a lawnmower.
 
AJ/FormS said:
... I mean, I install TQs on 318s all the time. and they sound faster. But they're not much if at all, any faster than a 2bbl, at least not until she gets up on the cam, and then it's all over, cuz the cam and head combo, has the powerband of a lawnmower.
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You must be doing something wrong. If going for High Performance, I'd be changing cams and a few other parts. If you can tune a Holley, stick with them.
 
Here’s some list numbers for the 273 4 barrel

3853S

3854S

4121S

4122S

4119S

4120S
 
The “BEST” carburetor for YOUR engine is the one YOU know how to tune and does all the things you want your carburetor to do. That’s the kind of answer that is correct when you ask the kind of question you asked. Until we have answers to the questions in post #4 from @junkyardhero everyone is guessing.
 
66fs said:
Those are 65 and 66. 67 Carter AFB's were 4294s and 4295s for the Federal carbs, don't have the California numbers off the top of my head.
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Those were the numbers off the top of my head. Thanks for refreshing my memory.
 
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