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manifold adapter?
https://slantsix.org/forum/viewtopic.php?t=23602		 Page 1 of 2
Author:  fede-valiant [ Fri Jun 15, 2007 10:32 am ]
Post subject:  manifold adapter?
Hi guys!
Im about to replace my old one barrel holley for a 40/40 dual barrel...
I need to know if its possible to adapt my manifold (one hole) to palce the new carb... is it possible, I mean without changing the original manifold?
Thanks!
Author:  oldgoat83 [ Fri Jun 15, 2007 12:13 pm ]
Post subject: 
If you search on here for such a thing, you will find that it is possible, but not recommended.
Author:  SlantSixDan [ Fri Jun 15, 2007 1:04 pm ]
Post subject: 
It is possible, but it is a bad idea. Much better to start with a manifold intended for a 2bbl carburetor.
Author:  icaneat50eggs [ Fri Jun 15, 2007 1:33 pm ]
Post subject: 
Like trying to breathe through a straw.
Author:  fede-valiant [ Fri Jun 15, 2007 2:44 pm ]
Post subject: 
Why is it not recommended?
Does it lose power?? has someone done it with bad experience??
Thanks.






www.dodge-tech.com.ar/forum
Author:  icaneat50eggs [ Fri Jun 15, 2007 3:09 pm ]
Post subject: 
The one barrel opening is too restrictive
Author:  Jopapa [ Fri Jun 15, 2007 3:25 pm ]
Post subject: 
Quote:
The one barrel opening is too restrictive
Is it the bore of the single barrel opening on the manifold, or are the manifold runners themselves smaller than those of a Super Six manifold? If it's only the opening for the carb, them I would think that could be machined out, with new holes drilled for appropriately placed studs for a 40/40. But I'm only speaking in the sense of thinking that it could physically be done. I would expect starting with a Super Six intake manifold would still be far more feasable.
Author:  emsvitil [ Fri Jun 15, 2007 3:31 pm ]
Post subject: 
The bore in the manifold is the same size as the 1bbl carb.

With an adaptor the 2 bbls neck down to the 1bbl size, thus no gain.


Modifying the 1bbl manifold has been done (bet SSDan knows the link) for 2bbl carbs
Author:  radarsonwheels [ Fri Jun 15, 2007 3:51 pm ]
Post subject:  huh?
If the runners are the same size, why not just hog out the manifold to the same size as the carb gasket? It would be easy to use the adapter as a guide, and don't people use carb spacers as a performance upgrade anyway?

I figured that people here would be into doing it themselves? Or maybe the 2 barrel manifold isn't that hard to find?

Kevin
Author:  mrhite65 [ Fri Jun 15, 2007 4:18 pm ]
Post subject: 
Is this what you're trying to do?
Image
Image
Author:  SlantSixDan [ Fri Jun 15, 2007 4:18 pm ]
Post subject: 
The 2bbl intakes aren't hard to find in North America. Not sure what the situation is in Argentina. Here's an article (pdf) on how to grind & modify a 1bbl intake to accommodate a 2bbl carb, with parallel orientation (factory 2bbls were perpendicular).
Author:  dakight [ Fri Jun 15, 2007 4:23 pm ]
Post subject: 
It can be done but there isn't a lot of real estate to work with and a 40/40 is a sizable pair of bores. It would be tricky at best. Even the "Super Six" manifold will require an adapter. I would think it would be more feasable with a 4 bbl manifold such as a Clifford or Offy. You would then be able to turn the carb 90* for improved fuel/air distribution. It seems to me anyway, but I've never done it - maybe someone here has.
Author:  61 V200 [ Sat Jun 16, 2007 8:51 am ]
Post subject: 
Here's my modified 1 bbl

Image



Image
Author:  Rug_Trucker [ Sun Jun 17, 2007 8:35 am ]
Post subject: 
I've seen stock intakes modified to 4bbls! BTW what is a 40/40? 40mm?
Author:  dakight [ Sun Jun 17, 2007 6:59 pm ]
Post subject: 
That's what I took it to be; 2 barrels, 40 mm each. Tha'ts a big carb.
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