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440 intake curiousity #2785712
06/15/20 01:29 PM
06/15/20 01:29 PM
Joined: Nov 2003
Posts: 10,228
Colleyville
3hundred Offline OP
I Live Here
3hundred  Offline OP
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Joined: Nov 2003
Posts: 10,228
Colleyville
Years ago I had a CH4B that had the center divider cut down about 1" from the carb flange. Was wondering on a stock 440 what would be the effect of cutting down that divider about 1" ?

IMG_0022.jpg

'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: 440 intake curiousity [Re: 3hundred] #2785713
06/15/20 01:33 PM
06/15/20 01:33 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Online work
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Cab_Burge  Online Work
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Joined: Aug 2003
Posts: 43,007
Bend,OR USA
Do it and find out sawzall work


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 440 intake curiousity [Re: 3hundred] #2785748
06/15/20 02:55 PM
06/15/20 02:55 PM
Joined: Jan 2003
Posts: 30,947
Oregon
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AndyF Offline
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AndyF  Offline
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Posts: 30,947
Oregon
You probably won't be able to notice the difference

Re: 440 intake curiousity [Re: AndyF] #2785749
06/15/20 03:06 PM
06/15/20 03:06 PM
Joined: Nov 2003
Posts: 10,228
Colleyville
3hundred Offline OP
I Live Here
3hundred  Offline OP
I Live Here

Joined: Nov 2003
Posts: 10,228
Colleyville
Originally Posted by AndyF
You probably won't be able to notice the difference


Okay, backstory, I was told the modded CH4B was on a 505 stroker w/ a 750 CFM carb. Supposedly the mod was to make the engine perceive the carburetor was bigger? shruggy

I've been toying with the long term idea (probably never happen) of a sniper fuel system thinking the mod would eliminate the dual plane problem with FI. In the meantime I was just curious what it would do with the stock carburetor.


'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: 440 intake curiousity [Re: 3hundred] #2785754
06/15/20 03:21 PM
06/15/20 03:21 PM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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fast68plymouth Offline
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fast68plymouth  Offline
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Posts: 14,479
So. Burlington, Vt.
Only one way to know for sure exactly what it would do on your combo.

The good news is, if for some reason it’s not to your liking....... it’s not that hard or expensive to find a replacement.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: 440 intake curiousity [Re: 3hundred] #2785851
06/15/20 08:42 PM
06/15/20 08:42 PM
Joined: Feb 2005
Posts: 4,309
Prospect, PA
BSB67 Offline
master
BSB67  Offline
master

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Posts: 4,309
Prospect, PA
If the intake is limiting power output of a motor that has additional potential, then milling the divider will likely add peak power, and may, or may not impact lower rpm power.

Re: 440 intake curiousity [Re: 3hundred] #2785863
06/15/20 09:56 PM
06/15/20 09:56 PM
Joined: Oct 2007
Posts: 4,205
New York
polyspheric Offline
master
polyspheric  Offline
master

Joined: Oct 2007
Posts: 4,205
New York
A 1" open spacer (if it fits your hood, linkage, fuel line, etc.) has a similar effect.
Expect:
1. idle quality suffers slightly, idle vacuum lower
2. response may need more pump shot
3. mileage may go either way
4. peak power increased slightly (most if plenum and/or carb is small)
5. cylinder to cylinder distribution may get worse (on a well-developed manifold)


Boffin Emeritus
Re: 440 intake curiousity [Re: 3hundred] #2785968
06/16/20 10:57 AM
06/16/20 10:57 AM
Joined: Jan 2008
Posts: 1,206
Minn
S
SportF Offline
pro stock
SportF  Offline
pro stock
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Joined: Jan 2008
Posts: 1,206
Minn
Years ago (maybe like 50) I had a factory 4 hole 383 manifold that I made into one big square hole. All blended and looking great. I thought it was working until I put on my two barrel manifold for winter driving. The two barrel was such a marked improvement in performance it was rather unbelievable.

My mechanic neighbor said something to the effect "did you think the factory guys were stupid?"

My only reply was to toss the manifold.







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