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4bbl on a 4.0 |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6753 |
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Not all factory intakes were the same for the 4.0l. Too bad the pictures don't come with this but this post identifies a factory intake swap with larger runners and flow:
This is a fuel injected intake, but there are people taking the AMC V8 FI intakes and bolting on carburetors for better flow. Don't see why this would be a different situation.
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Thanks for the replies. I would have to look at the factory intake better before making a decision to mid it to a 4bbl.
It is the big plenum intake and not my engine
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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72gremx401
AMC Apprentice Joined: Oct/02/2014 Location: bc Status: Offline Points: 122 |
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I would like to see a 4 liter with a 232 crank build . 258 stroke, pistons dont last long with high RPM .
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1972 gremlin x 401
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Online Points: 16591 |
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Jmerican
AMC Addicted Joined: Mar/29/2016 Location: Seattle, Wa Status: Offline Points: 585 |
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I dig the idea. I do agree with Heavy, and I also think that you know what to do, John. I have one sitting around if you want me to measure or mock up the deal. Maybe I will anyway.
I don’t know what that last post means with the small runner thing. They are nice ports, as you already know. Here is a caveat. The manifold is truly made for the late late head. It will bolt up to earlier 630 heads and such, but the late curved big plenum manifold has raised ports; raised by like .100? It’s workable and fixable, but just know. The Edelbrock is not raised like the last of the head castings. Pretty sure, not positive.
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Jmerican
AMC Addicted Joined: Mar/29/2016 Location: Seattle, Wa Status: Offline Points: 585 |
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My 99 XJ has the 630 head - and the late manifold that you’re referring to. The port was a bit off. I have a late late head, as a mock-up, and it’s raised. The 99 was a bit of crossover. Luckily it did t have that casting that cracked. I have One that’s cracked, it’s the raised port. I’m not sure how out there that lil tidbit is known.
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wittsend
AMC Nut Joined: Apr/15/2020 Location: California Status: Offline Points: 413 |
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FWIW I too had thought about the idea of welding a 4 bbl. plate to a milled top 4.0 manifold. And by "big plenum" I assume you mean the Horseshoe intake. I was just going by the externals when I pondered it, not knowing the I.D. of the passages. My concern was the plenum was too big, not that the passages were too small. Sometimes folks (of lesser means) have the manifold just sitting around, are in a trade school..., have an uncle with a machine/weld shop or some similar situation. They are inquisitive and for nothing more that their "hobby" time want to give something like the manifold adaptation a "go." To them it makes more sense than earning the money to buy a product. 45+ years ago I welded up a 90 degree adapter out of sheet steel to fit a Datsun down draft manifold with a side draft SU carburetor. It actually worked pretty well. So, you never know. For YOUR application, budget and needs your idea might be sufficient. Edited by wittsend - Apr/22/2023 at 11:10am |
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'63 American Hardtop
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Javelin_GT
AMC Addicted Joined: Feb/15/2008 Location: Colorado Status: Offline Points: 1066 |
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Check with these guys.....I seem to think they have done this in the past but dont see it on their website. |
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72gremx401
AMC Apprentice Joined: Oct/02/2014 Location: bc Status: Offline Points: 122 |
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yes the 232 had a 3.50 stroke compared to the 3.44 of the 4 liter , not many have done it . so i have seen few results . Might be a good mix of torque and power ?
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1972 gremlin x 401
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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This is the intake in question
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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