The Stovebolt Site Forums The Shop Area Engine Shop Carter AFB on 292 motor

Just a status update on the carb that I installed on my 292 in my 64 C10. It's a Carter 625 AFB 4-barrel on an Offy manifold with Hedman Hedders:

[img]http://www.chevyasylum.com/64c10/64c10_314r8.jpg[/img]

I was slightly concerned that it might havre some driveability problems and maybe a loss of low-end power. I was wrong. It's runnin better than it ever has.

The AFB is a vast improvement over the Monojet and it has plenty of power. I took a load of stuff to the dumps this morning and had an opportunity to test it under load at low, mid and high rpm situations. Smooth as silk.

I live at the bottom of a hill...and to leave the area where I live, I have to climb that hill...with the Monojet and a cold motor, I'd have to leave the truck in 2nd gear and run up the hill very slowly. If I tried to shift to 3rd halfway up, it would spit and sputter and I'd end up shifting back down to 2nd.

Now, with the Carter and the headers, I can shift into 3rd halfway up the hill and it doesn't even notice that it's climbing a hill...even fully loaded with junk for the dumps.

I think this is a very viable modification for a 292...and maybe a 250 (might wanna run a 500 CFM), since most of the time it's only running on the primaries. Ohhh....when the secondaries open, it REALLY wakes the motor up. I may be doin a rebuild sooner than I planned, cuz it seems to like to rev very freely.

I said that I'd admit it if the AFB didn't work...well, it turns out that it's worked better than I ever expected.

That is good to hear. We might have to do that to a hot 261.
[img]http://67-72chevytrucks.com/vboard/images/smilies/burnout.gif[/img]

That extra pep and response is nice huh! I basically got the same setup with GM HEI. "Truckedup" hooked me up with a Holley 450 cfm w/ vac. sec. I like it. I like it a lot!
I was just offered an 8 lug Dana with approx. 3.55 gear (may be a bit high but, at least I can buy gears that don't cost $468!) from a '68 Chevy truck. Yeehaw! Get me to that freeway!

Asylum, Looks good, clean setup, power sounds awesome. How are you going to heat the intake?
Mugsy, What did that Dana come of I need one? Like to hear what you have to do to get it in.
Larry
68 C20 327 daily driver
63 C20 292 Camper truck
65 C10 ? Custom Cab AC,PB,PS,$flasher - Project

ChevyAsylum,

Good deal! I'm running a 500 cfm Edelbrock on my 292 and I had similar fears. I'm running an aftermarket cam and headers and mine runs great! Other than some minor adjustments to the idle mixture screws my Edelbrock is running as set by the factory.

Can you email me pics of your throttle cable setup? I have a 1966 shortbed stepside and still haven't been able to put together a throttle cable setup that allows me to take full advantage of the carb secondaries.

-ftyler

LGriffin,
You brought up a good point about heating the intake. I looked at the pic and was so blinded by that shiny carb I didn't notice there was no heat.

The guy with the Dana rear said it's from a '68 Chevy "Camper Special". He said it's original and also said it came with factory front disc brakes! It sounds like a straight bolt in as he said the truck has control arms just like mine. I've been on the hunt for 5-6 months for an 8 lug rear that I could just bolt in so I wouldn't have to fork out $500 to Art Houser for the 3.90 he sells. I could be wrong but, I think my sm420 4 spd will work pretty well with the 3.55 Dana.

ChevyAsylum,

With some help and advice from "ftyler", I fabricated a 1/4" thick plate of aluminum and tapped it for two brass fittings. Made a gasket for the plate and used sealant on both sides then bolted it to the intake. Then I cut my heater hoses and installed T fittings, connected hoses to the T's and ran them over to my brass fittings on the manifold. Presto change o, water heated intake.

Ftyler: I'm not gonna heat the intake. So far, it's runnin fine and with the electric choke and the heat from the headers, it seems to be plenty sufficient.

The problem I see with a water-heated intake is that when ya need it the most, the water ain't hot enough to do any good. And when the water gets hot is when you'd be better off with a cooler manifold.

Also, what ya see in the pic is basically what I got on the cable linkage. It's a cable clamp held in place by one of the top plate screws on the carb and the other end goes to a Mr. Gasket throttle pedal with the same type of cable clamp. That's what the whole thing is....the Mr. Gasket pedal, cable and clamps. I spose I could have tried to adapt a pedal from another vehicle, but that ol pedal looked like a rat rod thing to me, so I bought one.

There are a few more pics on my website...the url's in my sig.

Mugsy:

If I were to plumb water from the heater hoses into the fittings on that manifold, I'd be tryin to burn water. They go right into the intake planum; they're vacuum ports. Clifford sells a water-heated manifold, but the Offy isn't water heated. It's made to mate up to the stock exhaust manifold and use the exhaust gas heating.

We put a Carter 400 CFM AFB on our shop van Foorrdd with 300 CID 6. Picked up a tremendous amount of power, and even better fuel economy. That one barrel was really choking down the engine.

Used the Offenhauser intake with heat. Had it on for several hundred thousand miles until the van rusted out the third time (I love Missouri salt and cinders in the winter - NOT).

The only mod to the carb was to ditch the electric choke, and hook up a manual choke. Much more reliable for vehicles that have to start in all kinds of weather.

Jon.

I didn't mean use the vacuum ports. You've got to fabricate and attach an aluminum plate where the exhaust manifold bolts on. Drill holes and tap for fittings. Did it with my Offenhauser and got the idea from ftyler. Works nice I think.