Ok, I am done. Good luck with whatever you do with the Baracuda.

AZ

True dat. It will become a completely different animal.

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Official Cookie and Mater Tormentor.

I have been told that trying to tune the carburator that I have, which is the Truck Advenger 470cfm, for use on a car is a waste of time because it was designed for use on a truck. I say so what. I'll never use some of the added features like rock climbing at a 45 degree angle, but I think that this carb wouldn't be lacking any performance. I picked this carb because of the CFM. I have a few more cubic inches than most slants and thought the 390 might be on the small size.
Link of my carb.
http://www.holley.com/0-90470.asp

Link to a possiable Holley carb if you think the truck carb is a poor choice.
http://www.holley.com/0-1848-1.asp

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Your post has been very helpful. I'll remain clueless if you don't mind.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

That looks like an excellent carb, since it is relatively immune to cornering/accel/braking forces. A very nice size too. The fact it is "for a truck" has nothing to do with it's performance. You can tune it. Secondary opening, jets, and accelerator pump shot (put in a pump shot cam with longer/heavier squirt) are where I would start.

If secondaries are easy to adjust, back them all the way off in one direction (fast opening), make a couple of runs to see response, go to the middle of the range and make more runs, and go all the way to the other end of the range (slow opening) and see how you do.

Lou

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Home of Slant6-powered fun machines since 1988

I dont think carbs know if they are on a truck or car......and if they did they can be easily tricked.

I think your carb choice is a very good place to start.

Your tuning steps are in the right direction and will yield results in time.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

Talked to the Holley tech support about this and I was surprized to hear what they had to say. Basicly this Truck carb has lots of compermizes built in to it. Very confusing but something about extra porting around the metering block to help stop flood over in extreme angles. Some thing also to do with the air bleeds. They said "This carb will provide poor throttle responce and poor fuel mileage." They recommended the 570 Street Advenger. This carb is a 510 CFM 4 barrel. The 570 or 70 is some sort of marketing theam.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Carb tuning is where it's at for this stage of the build.

I can spend hours tuning one until I get it right or until I have exhausted all possibilites and try another one.

I run a 500 Cfm Carb on my 232 CI motor and I have tried 4 different carberuetors over the years - they were all very similar carter 4 BBl's and It did take me a while (6 years) to learn what to do to get the desired results.

Greg

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http://www.youtube.com/hyperpack

heh, I wish I'd read this thread before I wrote the response in the "Other" forum. Keep tuning, and be meticulous.

As for the truck carb not doing well, I'd keep at it before I gave up. The air bleeds tend to have a pretty small effect (ie - everything else needs to be damn close before you notice that they're wrong). I'm going to guess that the air bleeds are set rich on the truck carb... not easily remedied, unless it's got replace-able air bleeds.

Install the 570 Street Advenger. At this point I am very happy. Ran prettey good out of the box with Orange cam, 54 primary jet, 65 secondary, silver spring, 85 power valve, 31 nozzle.
I was running a bit lean under part throtlle and rich wide open.
There are a few steps to this point but I ended up with:
Orange cam
56 primary
57 secondary
45 power valve
31 nozzle
Silver spring. (still need to play with the spring yet)

Now I am running at part throttle to moderate throttle. 15:1 +- .5
Under full throttle 13.5:1 +-.5
No bog off the line.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Cool! Progress is being made.

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Official Cookie and Mater Tormentor.

keep with it you will be more satisfied with the results. slantsixs are the best

This converter is or was designed/built to run behind a slant. Its also suppost to be a 3000 stall. Do converters loosen up with use? This one seems to be stalling around 2400 rpm.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

does it feel stronger with the new carb?

As far as I know, converters do not "break in". They are supposed to stall their rated stall right out of the box.

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Official Cookie and Mater Tormentor.