I ran an offenhauser with the holley#4412 500cfm 2bbl. That is a killer street combo..gave them rice mobiles a fit
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| 4Bbl to 2Bbl adapter for Offy Intake https://www.slantsix.org/forum/viewtopic.php?t=52081 |
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| Author: | roadrunnerh [ Wed May 15, 2013 4:21 pm ] |
| Post subject: | 4Bbl to 2Bbl adapter for Offy Intake |
OK, so after reading about swapping a 390 cfm 4bbl on an Offenhauser intake for my '75 Slant 6, I realize most folks recommend a 2bbl on an otherwise stock motor (with less restrictive exhaust). I am considering going with an adapter for my Offy and mounting a Holley 2Bbl which originally was for '68 and '69 383s. Any feedback? |
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| Author: | DusterIdiot [ Wed May 15, 2013 4:35 pm ] |
| Post subject: | Bolt pattern wrong... |
Holley 2210 or the later 2245 (and the 'big BBD') found on the big block will need a custom mount as it doesn't share the more common 2300 bolt pattern (found on Ford and the 6 pak mopars...), you would also need another adaptor if going back further to say a small block BBD or Holley 2280. The big block holley will also be a bit rich in all respects, and can't be tuned like the stocker model holleys. Just FYI before you get it all in hand and go "D'oH!" -D.Idiot |
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| Author: | roadrunnerh [ Fri May 24, 2013 11:32 am ] |
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So what options do I have as far as using the Offy 4bbl intake with a 2 bbl carb? I see several differnt adaptor plates on ebay. None of these would work? I would rather not have to but a manifold if I can somehow use this one. |
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| Author: | roadrunnerh [ Fri May 24, 2013 12:01 pm ] |
| Post subject: | |
How about this piece? http://www.ebay.com/itm/Mr-Gasket-2bbl- ... _234wt_647 |
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| Author: | DusterIdiot [ Fri May 24, 2013 1:44 pm ] |
| Post subject: | Looks like... |
The bolt patterns on it are for Holley 2300, and the inner slots might be "little BBD/Holley 2280".... -D.Idiot |
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| Author: | NCDemon1971 [ Fri May 24, 2013 6:35 pm ] |
| Post subject: | |
I ran an offenhauser with the holley#4412 500cfm 2bbl. That is a killer street combo..gave them rice mobiles a fit
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