03-23-2018, 01:04 AM | #1 |
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Carb adapter help
Hey folks,
A friend gave me a holley 2 barrel and adapter that fits my 292, kind of. Even with a fat gasket, I'm bottoming out with the bolts coming out of the intake manifold. See poor quality night pictures. Any ideas? Anyone know where to find replacement bolts so I can try and cut them down if need be? Thanks in advance for the help. |
03-23-2018, 02:14 AM | #2 |
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Re: Carb adapter help
Looks like you will have to remove these OEM studs with vice-grips, and find some other studs that have deeper threading.
What CFM is the 2-Bbl Holley?
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
03-23-2018, 08:03 AM | #3 |
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Re: Carb adapter help
I think with the interference you might have to remove the studs and use bolts.
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03-23-2018, 08:05 AM | #4 |
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Re: Carb adapter help
Also the studs are threaded into the intake so they will screw out.
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03-23-2018, 10:26 AM | #5 |
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Re: Carb adapter help
Not sure on the cfm, the 1 barrel was acting up and the holley was free from a friend to try. The holley came off of a dodge 360/400.
Anyone know the size/thread pattern of the studs? Last edited by Bisblue; 03-23-2018 at 10:44 AM. |
03-23-2018, 10:32 AM | #6 |
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Re: Carb adapter help
You can just go to the Hardware store and buy a piece of threaded rod with the same threads and cut to the length you need. It doesn't look like you can get a bolt in the hole with the interference.
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03-23-2018, 10:49 AM | #7 |
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Re: Carb adapter help
I think you need a different adapter. Take a look at this video and fast forward to about the 5 minute mark. https://www.youtube.com/watch?v=x-UfzjIAOXo
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03-23-2018, 11:11 AM | #8 |
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Re: Carb adapter help
Thanks for the heads up, I ordered something similar and the bolt pattern was too narrow. Also the difference between free and 50 bucks for the one I've got. I'll get some shorter studs, and see if it works, they're 1.50 each, if not I'll look again for the right adapter that's wider.
Last edited by Bisblue; 03-23-2018 at 11:17 AM. |
03-23-2018, 12:13 PM | #9 |
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Re: Carb adapter help
I bought an adapter at O'Reilly's. I'll look tonight and see if I can find the pn. I don't think it was very expensive.
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03-23-2018, 12:21 PM | #10 |
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Re: Carb adapter help
Thanks,
mine is a 2 15/16 pattern. The transdapt 2041 is 40 bucks on amazon. Even the shortest studs I can buy are too long. I might just suck it up and get the right adapter. Last edited by Bisblue; 03-23-2018 at 05:30 PM. |
03-25-2018, 02:09 AM | #11 |
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Re: Carb adapter help
At one time, I was going to use a similar Offenhauser 5710 [2-into-1] adapter on my stock intake to put a Holley/Weber 5210, progressive-linked 2 Bbl on my 292. I had the same problem, that the adapter holes needed to be hogged out quite a bit to fit the GM L6 manifold pattern.
I was told by ''helpful speed shop owners" that the 5210 didn't have enough CFMs to power my .030-over-bored 292. So I bought an Offy 5416 4 Bbl intake, a Holley #8007 390 CFM 4 Bbl, and Clifford Headers. I have no regrets, but researching lately, I found out that the stock Monojet flows about 250 CFM [GM was never CFM-specific about carbs, like Carter, Holley and Edelbrock]. The Holley/Weber 5200/5210 flowed about 280 CFM. So it might have been an improvement. Buying the Big Boy toys, 40 years ago made me a bigger boy, I guess. Except for the 390 Holley, I still run that gear on my current 292 L6 engine in the same truck.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 03-25-2018 at 02:19 AM. |
03-25-2018, 10:19 AM | #12 |
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Re: Carb adapter help
Thanks for the info Orange,
I've got a 283 I'm gonna throw in it. Mainly I got a free 2 barrel and was having issues with my monojet, so looking for a fix for a couple months, until I get the 283 ready to go in. I broke down and ordered the correct transdapt adapter, we'll see how it goes. |
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