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283" 2x4 intake swap to 327" 2x4 intake

 
Old 04-05-2019, 12:36 PM
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cheapstreetduster
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Default 283" 2x4 intake swap to 327" 2x4 intake

Gentleman. I have just realized that the factory 61 2x4 cast aluminum intake manifold on the 283" engine
will not fit on the new ,almost completed 327 headed engine.
the intake windows are quite a bit different in size..and layout.
the new engine is a 350" with the 66 327 heads.rebuild.factory cast iron heads.
obviously the intake windows on the new 327 is larger. my question is.
can I port the window of the 283 intake on the floor enough to make this intake fit?
is this a viable or realistic option? I am considering port volume further up in the plenum. (i am wondering if this is going to be a huge restriction?)
i am also considering that porting the floor will end up making the manifold to thin.
Is attempting to port this factory 2x4 intake a realistic option? I have not had a chance to study it yet.. but the floor looks to be were it will need the most grinding.
I want to keep the stock appearance.. keep the stock carbs linkage ,air cleaner. ect.
is there a compatible 327" 2x4 intake that would otherwise be the same?
is so does anyone have a recomnedation or part number for it.
or
IS porting the 283" intake manifold going to be a viable option with out much issue or problem.?

anyone have any advice to my situation.?

Last edited by cheapstreetduster; 04-05-2019 at 01:00 PM.
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Old 04-05-2019, 12:43 PM
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Originally Posted by cheapstreetduster View Post

anyone have any advice to my situation.?
Yes I do. Unless you're after max power with your intake, bolt it on the engine and don't worry about it. It'll work fine that way.

Don't make it hard on yourself. I ran a 283 2X4 intake like that on my 327 for a couple of years.
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Old 04-05-2019, 12:56 PM
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Originally Posted by MikeM View Post
Yes I do. Unless you're after max power with your intake, bolt it on the engine and don't worry about it. It'll work fine that way.

Don't make it hard on yourself. I ran a 283 2X4 intake like that on my 327 for a couple of years.
I realise i could do this... but im not going to. lets just say i am looking for max effort.
i am either port match it by grinding the windows open. or if thats not going to work or its gonna be too thin..or ruin the intake .
or i am gonna source a new intake
i have a modern edelbrock 2x4 intake .. but it so far away from stock i am trying to avoid going this route..

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Old 04-05-2019, 12:59 PM
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Originally Posted by MikeM View Post
Yes I do. Unless you're after max power with your intake, bolt it on the engine and don't worry about it. It'll work fine that way.

Don't make it hard on yourself. I ran a 283 2X4 intake like that on my 327 for a couple of years.
This^^^. I am running the stock '61 270 HP dual carbs and intake on a 1968 vintage 327 that has a stroker crank (383 cid) and is running the big 2.02 461 heads from 1965. The ports on the heads are huge, the ports on the intake are tiny. That said, the set-up works just fine and looks very cool. I would pick up an easy 50 HP if I bolted the 'correct' 4bbl intake on the engine that matched the ports in the heads, but I'm fine with where I'm at, performance-wise. The neat thing is, my 383 is identical to the original 283.....but with a whole bunch more power.
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Old 04-05-2019, 01:08 PM
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Originally Posted by MikeM View Post
Yes I do. Unless you're after max power with your intake, bolt it on the engine and don't worry about it. It'll work fine that way.

Don't make it hard on yourself. I ran a 283 2X4 intake like that on my 327 for a couple of years.
I realise i could do this... but im not going to. lets just say i am looking for max effort.
i am either port match it with a grinder. or if thats not going to work or its gonna be too thin..or ruin the intake .
or i am gonna source a new intake
i have a modern edelbrock 2x4 intake .. but it so far away from stock i am trying to avoid going this route..
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Old 04-05-2019, 01:15 PM
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Yes, it can be done. I have a 1967 327 block with a stroker crank, Edelbrock aluminum heads with a port matched original 2x4 intake.
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Old 04-05-2019, 01:17 PM
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You can open the ports a little, but not enough for a port match....not even close. If you want max performance out of your engine, you need a different intake and induction system. The WCFB carbs are only about 380 CFM each, as-is. I find them to work very well on my 383....and suspect they would be a bit over-carbed on a stock 283 engine. Again, I'd pick up an easy 50 HP with an Edlelbrock intake and a Holley 700, but I'm into the original 'stealth' look under the hood.
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Old 04-05-2019, 01:25 PM
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Since you are committed to this course of action, get a set of intake manifold gaskets that match your head intake ports. Turn your intake manifold over, match the intake gaskets to the mounting bolt holes, and mark the required manifold intake ports on the manifold with a black sharpie. Remove the gaskets and inspect the manifold. If you port the manifold to the sharpie lines (to match the heads) will the walls be too thin, the ports consistent to the carb pad, and the integrity of the manifold maintained? You now have your answer.
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Old 04-05-2019, 01:38 PM
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I wil say this. After a couple years of running the dual WCFB's on my otherwise stock 340/327, I put a 365/327 intake and 780 Holley carb on the same engine in the same car. No perceptable difference in power between the two setups.

I also ran one of those 2X4 Edelbrock manifolds with dual AFB carbs. Little if any difference in power over the two previous carb/intakes.

If you go grinding on the old Chevy 2X4 intake, you can kiss the value of it goodbye for most potential buyers.

Do what you like.
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Old 04-05-2019, 01:50 PM
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Originally Posted by MikeM View Post
I wil say this. After a couple years of running the dual WCFB's on my otherwise stock 340/327, I put a 365/327 intake and 780 Holley carb on the same engine in the same car. No perceptable difference in power between the two setups.

I also ran one of those 2X4 Edelbrock manifolds with dual AFB carbs. Little if any difference in power over the two previous carb/intakes.

If you go grinding on the old Chevy 2X4 intake, you can kiss the value of it goodbye for most potential buyers.
That and who knows if there will be enough meat left on the runners after grinding on it so that they don't crack when you torque it down to the heads.
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Old 04-05-2019, 01:56 PM
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Originally Posted by Avispa View Post
That and who knows if there will be enough meat left on the runners after grinding on it so that they don't crack when you torque it down to the heads.
The juice ain't worth the squeeze. Even if you port the stock intake, you cannot port it enough to make any discernible difference if you are still running the stock carbs. Either bolt on the stock set-up and run it as-is (like I and many others have done) or move on to a more modern intake and induction system that can maximize the potential of your cylinder heads and engine. Didling around with a grinder on a 60 year old intake trying to pick up 2 horsepower is time misspent.
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Old 04-05-2019, 02:32 PM
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Originally Posted by cheapstreetduster View Post

IS porting the 283" intake manifold going to be a viable option with out much issue or problem.? ?
Not sure its helpful, but I have a 2X4 57 up intake manifold, I got at a swap meet years ago,, I matched it to a stock intake gasket, and it is cut somewhat bigger than stock,,, I figure a racer opened it up for bigger heads that were available at the time,,, maybe 327 or 350, but just a guess, as I found it in the 80's!!! I never put it on an engine to try, but seems there is some room to open it a bit... Its been used and I don't see any cracks, so it may work... Let us know!!!

Last edited by knockbill; 04-05-2019 at 02:33 PM.
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Old 04-05-2019, 08:27 PM
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AlHewitt
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Like you I wanted to use my stock aluminum intake manifold on heads that had bigger intake ports. It was not 283/270 HP but a 327/350 HP/L79 intake to be installed on a GM SP383 crate engine with what they called aluminum fast burn heads. The tops of ports on the heads were so large that they were visible with the intake in place. So no gasket was going to cover the difference. I had a welding shop add aluminum to the tops of the intake and then had it machines for a flat surface. The additional metal added was about 1/2" on all 8 intake ports. The final intake was media blasted to erase any evidance of a modification. Now with correct gaskets the intake is tight and appears correct. The top of my engine is all L79 appearing... Al
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Old 04-06-2019, 12:07 PM
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Small intake runner into large head ports= OK.

Large intake runners into small head ports= sucks.

Look at a Torker II intake runner size.

Attempting to match the small intake runners to large head ports may very well flow worse than leaving them as is.

Doug

Last edited by AZDoug; 04-06-2019 at 02:15 PM.
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Old 04-11-2019, 10:51 PM
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since i went through the hassle of blue printing every other aspect of this new engine.. I dont want to just bail when it comes to the intake.
I really prefer to keep all the stock stuff back on this long block. so. I am going through the motions to satisfy my self as to what i am going to do for the/an intake. if i have to i may put the edelbrock on.. but only as a last resort. i am just trying to weigh my options.
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Old 04-11-2019, 10:57 PM
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Originally Posted by AlHewitt View Post
Like you I wanted to use my stock aluminum intake manifold on heads that had bigger intake ports. It was not 283/270 HP but a 327/350 HP/L79 intake to be installed on a GM SP383 crate engine with what they called aluminum fast burn heads. The tops of ports on the heads were so large that they were visible with the intake in place. So no gasket was going to cover the difference. I had a welding shop add aluminum to the tops of the intake and then had it machines for a flat surface. The additional metal added was about 1/2" on all 8 intake ports. The final intake was media blasted to erase any evidance of a modification. Now with correct gaskets the intake is tight and appears correct. The top of my engine is all L79 appearing... Al
this is basically the idea i was contemplating. I am capable of doing all of it my self.
My quandary is.. I have found over the yrs to never be too proud to ask around..that was the reason for this original post.
my luck id get all the work done modifying the 283 intake.. and someone who already figured this out tells me... why didnt you just buy an "XYz" intake .. it would have worked and saved you all that hassle... sort of thing.
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Old 04-12-2019, 12:12 AM
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We did this a few years ago. Joe "Devildog" here on the Forum ported a 283/270 intake and used it with WCFB's on a 400" motor. He welded about a 1/4" on top of each runner and then spent a lot of time making it look virgin. Turned out great and he's run it for years. We were scared to take out the rest of the plenum as things were getting pretty thin...but it hasn't cracked and he drives it all the time on roadtrips. We dyno'd it with the 2x4's, an air gap style Dart dual plane with 750 Holley and a Weiand single plane with same Holley.

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Old 04-12-2019, 10:57 AM
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A few years ago I built a 389 (.060over 383) for my 51 Chevy and used an early Z28 intake with a Q-jet. It ran GREAT! But I've always loved the early 2x4/WCFB setup. When I installed FI on the 56 40yrs ago, I bagged and shelved the 2x4 setup and there it has set all these years. A few days ago I pulled the intake from the 389 (gotta replace a piston) and so I'm putting the 2x4 setup on it, with a Batwing air cleaner. We'll see what happens.













Last edited by DZAUTO; 04-12-2019 at 11:13 AM.
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Old 04-12-2019, 04:01 PM
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Originally Posted by DZAUTO View Post
A few years ago I built a 389 (.060over 383) for my 51 Chevy and used an early Z28 intake with a Q-jet. It ran GREAT! But I've always loved the early 2x4/WCFB setup. When I installed FI on the 56 40yrs ago, I bagged and shelved the 2x4 setup and there it has set all these years. A few days ago I pulled the intake from the 389 (gotta replace a piston) and so I'm putting the 2x4 setup on it, with a Batwing air cleaner. We'll see what happens.












Tom,
Is that an original batwing or a repro?
Did I ever tell you the story of the time I bought an original for $7.00?
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Old 04-12-2019, 08:16 PM
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Originally Posted by 68hemi View Post
Tom,
Is that an original batwing or a repro?
Did I ever tell you the story of the time I bought an original for $7.00?
$7.00??????????????????????????????????? ???? DANG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Although, I clearly remember back in the day when those were SUPER UGLY (and still are), and many guys with 56-57 Chevys removed them, threw them back in the corner of the garage (or behind the house) and installed cool looking, small chrome air cleaners.

Mine is one of the recent repos and it is next to perfect. I just had to have one. Just got it painted (black) yesterday. I also have instruction decals for each pot.
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