Can anyone tell me...23" vs. 25" intake question

[James_Douglas]

Anyone have any idea id the port size and the bolt patter is the same on the 23" engines and the 25" engines? I do not mean are the entire intake manifolds able to swap, I want to know if the "tips" of the manifolds at the block are the same?

 

I may have the need to hunt down a late 50's Plymouth or Dodge flathead six manifold if they are the same in that respect. I need a two barrel manifold for a flathead six. Even if I have to make it.  I am also looking into the flathead eight manifold as well.

 

Thanks, James

[Loren]

The Plymouth manifold is much smaller (shorter and the ports are much smaller).

The flanges are the same shape but again are smaller because of the smaller ports.

The Chrysler ports are just under 1 1/2 inch. Plymouth is not even close.

I have an Edmunds 2x1 manifold for a Plymouth and an Offenhauser that I don't need.

What I am using is a 2x1 manifold for a Chevy 216. The outboard ports have to be moved 1/4 inch closer together and you need to make flanges to fit.

Then adaptors for the two barrel carbs I am going to use.

I've seen 2x1 Edmunds manifolds for Chrysler 8 on eBay but not lately.

I seem to recall there was a factory two barrel manifold for the 8 cylinder early on but they dropped them and made adaptors to retrofit singles.

 

[Dodgeb4ya]

1946-48 Chrysler eights were all 2BBL intakes...middle of 1947 thru 1950 used a two to one barrel adapter for 1BBL carbs.

 

[Frank Elder]

11 hours ago, Dodgeb4ya said:

1946-48 Chrysler eights were all 2BBL intakes...middle of 1947 thru 1950 used a two to one barrel adapter for 1BBL carbs.

 

I love when you drop your pearls of wisdom on us, I learn as I go thank you......?

[plymouthcranbrook]

Well I used a Langdons two barrel adaptor on my 52 and the difference in drivability  is very dramatic.  A little bit of adjustment needed but well worth it