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Stock Hemi intake #2696670
09/11/19 07:32 PM
09/11/19 07:32 PM
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fredericksburg,va
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cudaman1969 Offline OP
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fredericksburg,va
Anybody have the casting numbers by year 66-71 thanks

Re: Stock Hemi intake [Re: cudaman1969] #2696774
09/11/19 11:58 PM
09/11/19 11:58 PM
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Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
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All years have the same casting number but smaller details set them a part through the years

1966 Hemi Intake.jpg1970 Hemi Intake Big P.jpg
Re: Stock Hemi intake [Re: ScottSmith_Harms] #2696816
09/12/19 09:08 AM
09/12/19 09:08 AM
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Dallas, Texas
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FC7cuda Offline
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Dallas, Texas
Originally Posted by ScottSmith_Harms
All years have the same casting number but smaller details set them a part through the years


I agree! Still seem to read conflicting posts on the "P" stamping location/direction per year(s). Anyone know the final word?

Last edited by FC7cuda; 09/12/19 10:41 AM.


68 Charger
70 Cuda
Re: Stock Hemi intake [Re: ScottSmith_Harms] #2696852
09/12/19 11:02 AM
09/12/19 11:02 AM
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Posts: 8,192
fredericksburg,va
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cudaman1969 Offline OP
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Mine has the big pentastar in front?
Since I’m new to these intakes, why the difference on the front holes on back carb, I know the engine just runs off the back carb till you nail it.

Last edited by cudaman1969; 09/12/19 11:07 AM.
Re: Stock Hemi intake [Re: cudaman1969] #2696897
09/12/19 01:45 PM
09/12/19 01:45 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
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Spokane Washington
The P size and location varies, generally speaking the smaller P started in 1968, went to the larger style sometime in 69 and remained through 71. Location and clocking varied, likely random. They do not run on just the primary exclusively, the front carb (secondary) also has an idle circuit criticle to proper fuel distribution. The front to rear intake port variable is typical of a dual plane intake design, it has to do with proper fuel distribution at various rpms the first design without the Pentastar was the 1966 and early 1967 design, the Pentastar was added early in the 67 model year.

Re: Stock Hemi intake [Re: ScottSmith_Harms] #2696901
09/12/19 02:08 PM
09/12/19 02:08 PM
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VA
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dragon slayer Offline
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I think he is talking about the holes in the manifold. Most tuning recommendation is to add some idle rpm on the front carb so that you are not purely on the back at idle. But it is true that the back is doing the heavy lifting, with a progressive linkage that will not operate the front carb linkage at idle and low throttle application. I imagine that notch is to ensure some balance coming out of the rear carb primary venturi's at idle and low rpm. But no expert on that, just a guess.

Re: Stock Hemi intake [Re: dragon slayer] #2697008
09/12/19 08:57 PM
09/12/19 08:57 PM
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Michigan
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A727Tflite Offline
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Michigan
Originally Posted by dragon slayer
I think he is talking about the holes in the manifold. Most tuning recommendation is to add some idle rpm on the front carb so that you are not purely on the back at idle. But it is true that the back is doing the heavy lifting, with a progressive linkage that will not operate the front carb linkage at idle and low throttle application. I imagine that notch is to ensure some balance coming out of the rear carb primary venturi's at idle and low rpm. But no expert on that, just a guess.




Thats exactly why the notch is there-

Re: Stock Hemi intake [Re: A727Tflite] #2697334
09/13/19 10:54 PM
09/13/19 10:54 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
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Spokane Washington
This is a small "P" example, I've seen these on 67's and 68'

20190913_195056.jpg
Re: Stock Hemi intake [Re: ScottSmith_Harms] #2697459
09/14/19 12:51 PM
09/14/19 12:51 PM
Joined: Jan 2004
Posts: 8,192
fredericksburg,va
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cudaman1969 Offline OP
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Do the heat holes have to be blocked off or just left open (using headers)

Re: Stock Hemi intake [Re: cudaman1969] #2697467
09/14/19 01:24 PM
09/14/19 01:24 PM
Joined: Jan 2003
Posts: 10,666
North Dakota
6PakBee Offline
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North Dakota
You can leave them open, they both go into one large chamber in the manifold.


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