Inliners International Forums General Discussion Engines Holly or webber.....

Wondering what is the best app. for a 292 daily driver with a little zip... I will be rebuilding the engine and having the head done if that matters...

Webber for better mileage, if that is a concern.

MBHD

Over on the Hamb a guy went from a holley 2bbl to a Weber 32-36 progressive and picked up nearly 10 mpg. This was on a 153 in a Chevy II with a T5 tranny.

A progressive is where the mileage is. Regular Holley 350 and 500 2 barrels are not good for mileage.

Can anybody fill me in on the correct part or models numebrs for these Webers? Is it one of these?
http://www.webercarbsdirect.com/Weber_Carburetors_s/2.htm
Steve

The 32/36 DG?V (the ? is the letter given to which choke is used) are the progressive 2bl your looking for. The Holley/Weber 5200 is a licensed copy of the 32/36. Ford used the copy on Capris, and others. Stovebolt Engr. sells the 5200 as a kit for the stovebolt sixes. IIRC they do not recommend it for the 292.

Larry

At one time Holley made progressive 2 bbls made on the 350 or 500 sized carbs. Really, a 292 probably needs a carb in the 450 cfm area or two of the Webers.

The people at Clifford are saying to use a webber 38... how about that

I think this is a synchronous opening 2 bbl, not a progressive.

Yeah, that is what I am trying to figure out. Which one to use for the best gas mileage in my 1979 C10? I pulled out the old integral 250 and I am putting in a freshly rebuilt 292, mild cam (.514 lift/260 duration) with .40 over 30cc dished pistons (bought the rebuilt short block from Leo Santucci) and a 61cc head that has been rebuilt with hardened seats and springs to match that cam. Clifford manifold and Langdon cast headers. I have a new in box 390 Holley but I think I am going to sell it. My main focus is just a daily driver. I am not looking for high horsepower. I just want a reliable, easy driveing truck and as good a mileage as I can get. I like taking long trips. The whole idea of a progressive carb seems right to me. I've used Holley's before and they run OK but the mileage is awful for regular use. And I can't afford EFI. Any suggestions would be appreciated.

Just go with the 32/36 progressive. I would definitely recommend getting the distributor recurved by somebody that really knows what they are doing. This will dramatically help the mileage. What transmission and rear gear do you have?

I have a mild warmed over 292, .030 bore, ported, polished with a Wolverine 270 cam and Cast Headers. I put an Offy 3x2 intake with 3- Holley Weber 5200's. Ran straight linkage and now have disconnected the front and rear secondaries. With my T-5 tranny, I get 20-22 MPG at 65 MPH. Granted, my car weighs only 3,000 lbs, is chopped 4", and has 30" tall Tires on the back. The motor looks custom, sounds great and with mileage like that,it's a winning combo. I have not messed with that set up for 10 years and the carbs still run smooth. It was running way rich with all the secondaries hook up with no difference in performance!

You think just one 32/36 would be enough CFM for the 292? It has a TH350 and I think it is 3.08 or 3.42 rear. I'd have to check my documentation to be sure, can't remember right now. The distributor is a Pertronix Flamethrower II.

So basically you are just running one carb? 20-22 sounds great to me. That is what I am looking for. The 12MPG I got with the 250 was ridiculous and I am afraid the Holley will do the same thing.

12 mpg means something is wrong, and it has nothing to do with what brand carburetor.

would be enough CFM for the 292?
There's no such thing as "enough CFM". Most engines will run with 1/2 the "calculated" CFM - they just run out of steam sooner. There was an interesting thread the other day at Mopars about losing only 1/2 seconds by running a 440 with only the primaries.

There was definitely something wrong but with a 320,000 mile integral head 250 with a beat up Rochester that just would not respond to any tuning and numerous other problems it was just a matter of how far do you want to go with that motor. Wasn't worth it to rebuild it to me. I'm just trying to learn about a subject I am not real familiar with. That being 292's and the best setup for a streetable daily driver.
I think in the short term the best thing for me to do is run the Holley 390 with the Clifford setup I have now and record the data. And pick up a 32/36 Weber with the Clifford adaptor and then switch them and do the same recording and see the comparison. The Weber with adaptor is pretty cheap so it would be a reasonable experiment.
I see one problem with it though which I am not sure what to do about. Maybe you all would have a suggestion. What do I do with the trans kickdown cable on the TH350? The integral head had this wraparound bracket on the valve cover to hold the cable and feed it to the Rochester. It is not transferable to the new motor and carb setup. Still trying to figure out what to do there. Can that kickdown be vacuum operated?

For the kick down cable you can buy or make a bracket that uses the carb mounting studs.

I think you should consider an overdrive tranny like a 200-4R with a lockup convertor. You need to reduce the cruise rpm to get max mileage. This brings on a second problem in that the dist adv curve may not be giving you all the adv you need if you have the thing cruising at 1800 to 2200 rpm. You can play with limiters on the vac adv can but you can get pinging in certain situations.

I did a lot of recurve dists in the day but never with OD trannies. It would be an interesting experience.

I have been considering that, others have made the same suggestion. It is also an area I am not real familiar with. I believe the length is not the same so a trans mount cross member has to be moved or modified?? Anyway, I probably will do that soon or at least not too far down the road.