2bbl to 4bbl adapters
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Senior User
Joined: Jul 2003
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From: St. Louis, MO
2bbl to 4bbl adapters
I'm sure someone has already asked this question before however; considering there are tens of thousands of members and threads to match, I thought it would be faster to repost the question then to spend hours searching.
A friend of mine gave me a Holley 4bbl 600 cfm carburator that has only seen a few thousand miles of use. He wanted something bigger for his engine build and gave it to me thinking that I could use it someday. Well, can I use on a stock 351M with a carb. adapter? Are there any benefits? Would I lose my estimated 14 mpg highway figure?
I thought I read somewhere that with the right amount of intake velocity that this type of application would work just fine.
Thanks.
A friend of mine gave me a Holley 4bbl 600 cfm carburator that has only seen a few thousand miles of use. He wanted something bigger for his engine build and gave it to me thinking that I could use it someday. Well, can I use on a stock 351M with a carb. adapter? Are there any benefits? Would I lose my estimated 14 mpg highway figure?
I thought I read somewhere that with the right amount of intake velocity that this type of application would work just fine.
Thanks.
Posting Guru
Joined: Aug 2002
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I've used a Carter 625 on my 400 with a Mr. Gasket (1955 I think) 2x4 adapter. It worked alright.. they are very holy so they can be hard to seal and keep sealed. I swapped over to a Edelbrock performer 400 intake and it made a world of difference.
Most carb makers don't like the use of 2x4 adapters (found this out after reading the fine print..
)
Most carb makers don't like the use of 2x4 adapters (found this out after reading the fine print..
)
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Senior User
Joined: Jul 2003
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From: St. Louis, MO
So, if I can get a new intake manifold, are there any made for EGR provisions? I have to have this on the truck in order to past the emissions test next year. Or would I be better off with a larger 2V carburetor?
Posting Guru
Joined: Aug 2000
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From: PacNW
Edelbrock makes the Performer EGR 4V p/n 3771 manifold which when installed with the included 2V adapter is CARB approved as a stock replacement part. If you remove the 2V adapter and install the 4V adapter you can mount any square bore 4V carb on it. Note: The Performer EGR is a 4V manifold which comes with a 2V adapter to make it emissions legal. The 4V adapter is available from Edelbrock or you can buy one from FoMoCo as well.
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Tuned
Joined: Jul 2003
Posts: 455
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From: Berkeley
What bill said. But keep in mind the edelbrock 3771 is only smog-legal if you use the 4-to-2 bbl adapter and keep your stock 2-bbl carb. (at least here in Cali.)
This is because these motors (351m/400) never came with a 4-bbl from the factory. Of course, it might be simple enuf to swap out the adapter and carb between smog checks...
This is because these motors (351m/400) never came with a 4-bbl from the factory. Of course, it might be simple enuf to swap out the adapter and carb between smog checks...
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"My truck came with a Holley600on it and it also had a Carb adapter. I'd go with a 4bbl intake for better milege and power."
But it wasn't stock.
Bear in mind that the simplest visual check is going to see the illegal 4V carb and that in CA, the visual inspection outweighs the tailpipe check.
In other words, they will fail you even if the tailpipe passed, if the parts don't match.
But it wasn't stock.
Bear in mind that the simplest visual check is going to see the illegal 4V carb and that in CA, the visual inspection outweighs the tailpipe check.
In other words, they will fail you even if the tailpipe passed, if the parts don't match.
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