ive changed my exhaust manifold 2 times on my truck from 1 bbl set ups i take the intake and exhaust apart. its been a yr and still running fine. you mite have to heat the bolts holding them together
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| Converting 1 bbl AL manifold to 2 bbl manifold https://slantsix.org/forum/viewtopic.php?t=39931 |
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| Author: | tlrol [ Wed Apr 21, 2010 7:43 pm ] |
| Post subject: | Converting 1 bbl AL manifold to 2 bbl manifold |
Has anyone done the conversion of an AL 1 bbl manifold to a 2 bbl manifold? If so, has it lasted or did it begin to leak? The info here shows the use of JB Weld, etc to see the adapter plate. I am giving this some thought. I DO have the cast iron 2 bbl intake but I wouldn't mind giving the intake/exhaust manifolds a diet. In a truck installing that pair is a bear which extracts some pain from the installing party. I have a pesky manifold leak which I plan on Remflexing into submission. Three years is what I got for service from the FelPro gasket. |
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| Author: | Wesola78 [ Thu Apr 22, 2010 1:49 pm ] |
| Post subject: | |
I've never converted a 1bbl intake to a 2bbl intake, I've only read about it. An article that I read said to weld the new carb mounting surface to the intake after you finish cutting. However, JB Weld might work just fine. If you want to lose a few pounds in your truck, you might think about installing an aluminum intake. |
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| Author: | tlrol [ Thu Apr 22, 2010 4:02 pm ] |
| Post subject: | 1 bbl manifold to 2 bbl manifold |
I read the same thing. I'm not convinced that the filthy and old 1 bbl aluminum manifold could ever be cleaned well enough to get a good weld bead on it and the adapter plate. I'll look around for a 2 bbl AL manifold, or more likely just take aspirin before, during, and after the gasket swap. Damn that FelPro gasket set! Hopefully the Remflex gasket lives up to its reputation. |
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| Author: | valiant1966 [ Thu Apr 22, 2010 5:04 pm ] |
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Here is one that I built using JB Weld. It holds just fine. If you look close, it is bolted too. Had it on but it's off now while I work on other things. Need to work out linkage too. Just throttled by hand in the driveway while I had it running. http://s968.photobucket.com/home/obe1kanoby There are quite a few threads on here about this if you search. Maybe "one barrel to two barrel"? By the way, it is cast iron, not aluminum but should make no difference. I was gonna use an aluminum but didn't want to waste one so this was an experiment. I like the diet idea too. |
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| Author: | tlrol [ Thu Apr 22, 2010 11:48 pm ] |
| Post subject: | thanks |
Thanks for the link to what you did. It looks pretty solid and follows the general notion of really only relying on the JB Weld to serve as a sealer more than a mechanical fastener. I think I may give it a shot and see about converting the 1 bbl manifold into a 2 bbl. It should help out in the weight department just a tad. I think JB Weld is rated to 400 degrees F so it should be ok for the intake. |
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| Author: | Old6rodder [ Fri Apr 23, 2010 12:08 am ] |
| Post subject: | |
There're a couple pictures of a thinwall manifold conversion done with screws and epoxy in this link (sorry I didn't take a more comprehensive set of the plate mods). Couple years on the road now, with no problems. |
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| Author: | tlrol [ Fri Apr 23, 2010 6:01 am ] |
| Post subject: | Thanks again |
Thanks Old Rodder. Looking at these pictures makes it apparent that this can be done with good success. Like most things I imagine taking your time, cleanliness, and preparation is the key. Looks like I am hacking and cutting soon. Does anyone know if JB Weld is as good as it gets or is there something better than JB Weld? I have had good luck with JB Weld when used as directed but I wonder if there is something even better... |
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| Author: | mopar7671 [ Mon Apr 26, 2010 11:00 pm ] |
| Post subject: | 1 to 2 |
ive changed my exhaust manifold 2 times on my truck from 1 bbl set ups i take the intake and exhaust apart. its been a yr and still running fine. you mite have to heat the bolts holding them together
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| Author: | kman [ Tue Apr 27, 2010 7:33 am ] |
| Post subject: | Re: Thanks again |
Quote: Thanks Old Rodder. Looking at these pictures makes it apparent that this can be done with good success. Like most things I imagine taking your time, cleanliness, and preparation is the key. Looks like I am hacking and cutting soon. Does anyone know if JB Weld is as good as it gets or is there something better than JB Weld? I have had good luck with JB Weld when used as directed but I wonder if there is something even better...
these pictures helped me alot, the carb set up was all different on my 63. will adjust and get back to everyone.
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| Author: | Royceflo [ Tue Apr 27, 2010 5:49 pm ] |
| Post subject: | |
Pretty interesting idea. The thought never even occurred to me to convert a 1 barrel to a 2 barrel. I have a couple intakes in the basement, I kinda feel like tinkering anyways. Anyone have a good idea as to what would be an optimal thickness to make the adapter plate? Apparently it is a functional carb spacer to. I have a bunch of steel and a CNC. |
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| Author: | SlantSixDan [ Tue Apr 27, 2010 6:31 pm ] |
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I recently scored this, made from a 1960 aluminum 1bbl intake:    And this nice new 1.08" Motorcraft 2100 to try out on it:    This carb's intended application is 1974 Ford truck/van with 302 V8, so it's not a relatively primitive '60s carb and will stand up well to today's fuel formulations. The integral choke is easily electrified, too! 
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| Author: | tlrol [ Tue Apr 27, 2010 7:40 pm ] |
| Post subject: | |
Interesting work. Screwed and glued as it were? So, it looks to me that the 1 bbl boss was removed, some "milling" or at least flattening occurred, and then the 2 bbl plate was screwed (or bolted) on with some epoxy underneath it, It looks surprisingly well done. |
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| Author: | SlantSixDan [ Tue Apr 27, 2010 7:51 pm ] |
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Haven't had a chance to scrutinise it closely yet, but what interests me is the arrangement of the four bolts…which look like they're on a standard BBD/2280/WW3 2bbl pattern. |
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| Author: | Wesola78 [ Wed Apr 28, 2010 7:37 pm ] |
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Whoa! Nice score Dan!  Seeing all these pics kinda makes me want to experiment/hack up/butcher one of the extra 1bbl intakes in my garage.  That carb looks good too! 
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