Engine: intake manifold observation

[what huh]

Im switching my 259 over to 4bbl and something that I have seen before caught my brain in a different way today.

To my understanding the stock 4bbl intake manifold is a dual plane intake because of the divider running down the middle.
What are those cut outs for directly under the mating surface for the intake to carb?
Do they even out pulses, they for drive-ability?
Do those cut outs make it a single plane? 1.5 plane ?

[gordr]

Just regard it as a balance tube, something that most factory multi-carb setups have.

[StudeRich]

Looks like a square bore Intake for the smaller secondary throttle plates on a Carter WCFB 4 Barrel.

It was cast March 15, 1962 for a '62 Model.

[bensherb]

Interesting, I just checked the manifolds I have and one is like yours, the another is totally seperated left and right with just a thin bridge between front and rear, and the third has a single large hole left and right but still totally seperated.

[64studeavanti]

Interesting, I just checked the manifolds I have and one is like yours, the another is totally seperated left and right with just a thin bridge between front and rear, and the third has a single large hole left and right but still totally seperated.

The first with the balance slots is regular Stude. If AFB, also used on R2. The second is likely R1 since they did not have the slots. The third is likely a 2 bbl conversion.

[Warren Webb]

It was cast March 15, 1962 for a '62 Model.

Is there a chart somewhere where the casting dates can be interpreted? I have a manifold very similar with the date 2 23 M

[what huh]

So I thought it would be easy to find a adaptor to put a Holley on my engine.

This intake has spread-bore mounting but square-bore holes. The Holley has square bore butterfly’s and square bore mounting

I would like to keep the plenum in my adaptor plate but all the ones I find are all open.

I might make my own, I got a 1” thick piece of 6061

[64studeavanti]

Is there a chart somewhere where the casting dates can be interpreted? I have a manifold very similar with the date 2 23 M

I believe 2 23 M translates to February 23, 1958. Likely a 58 model manifold. I believe they skipped the letter Q because it is similar to the letter O.

[thunderations]

A machine shop with a milling machine could easily modify your manifold to accept the carb you want to use. It's done often in the Studebaker world.Two barrel manifolds can be milled and new holes and mounting studs for 4 barrels are done all the time.

So I thought it would be easy to find a adaptor to put a Holley on my engine.

This intake has spread-bore mounting but square-bore holes. The Holley has square bore butterfly’s and square bore mounting

I would like to keep the plenum in my adaptor plate but all the ones I find are all open.

I might make my own, I got a 1” thick piece of 6061

[bensherb]

So I thought it would be easy to find a adaptor to put a Holley on my engine.

This intake has spread-bore mounting but square-bore holes. The Holley has square bore butterfly’s and square bore mounting

I would like to keep the plenum in my adaptor plate but all the ones I find are all open.

I might make my own, I got a 1” thick piece of 6061

I don't quite follow what you're talking about. "Spread bore mounting" ? Holley carbs just have a different, slightly larger, pattern than Carter carbs have. The Edelbrock #2696 carb adapter is a four hole, no open plenum adapter and will fit a spread bore carb to a square bore manifold and has both Holley and Carter bolt patterns. Should be able to flip it to put a square bore carb on a spread bore manifold. https://www.marineengineparts.com/ed...to-spread-bore

What Holley carb are you wanting to use , a 6210 spread bore? Or 4150/60 square bore? The 6210 is a replacement for a Rochester Quadra Jet and has a different mounting pattern than the other carbs.

[what huh]

I have a 4160 390cfm

The adapter plate that you linked doesnt match the holes in the manifold or the carb at the same time, just one or the other based on how you flip it. It may work but puts unneeded turns or sharp edges in the path that fuel will unvaporize(wrong word probably) back into a liquid.

I know it’s just 259 but I like tweaking and learning

[bensherb]

It sounds like you have a manifold for a Carter WCFB, which has yet another different bolt pattern. If that's the case you need this adapter, it will fit either the standard Holley or Carter carb to your WCFB manifold or the Holley to the AFB manifold. https://www.speedwaymotors.com/Holle...hoCdZAQAvD_BwE

If you really want to make a spacer/adapter, make it from phenolic it'll help with heat soaking and fuel percolation. The currently available fuel boils quickly and anything you can do to avoid it is a good thing.

[what huh]

It sounds like you have a manifold for a Carter WCFB, which has yet another different bolt pattern. If that's the case you need this adapter, it will fit either the standard Holley or Carter carb to your WCFB manifold or the Holley to the AFB manifold. https://www.speedwaymotors.com/Holle...hoCdZAQAvD_BwE

If you really want to make a spacer/adapter, make it from phenolic it'll help with heat soaking and fuel percolation. The currently available fuel boils quickly and anything you can do to avoid it is a good thing.

YEEES! That’s exactly what I’m looking for, I bought it.

Thank you, I still have the slab of 6061, I may still make it over the winter but cruisers weekend in ocean city, MD is coming up quick