Technical Sbc factory aluminum intake ID help

Rumors are those are military.
Maybe someone here knows why all the extra holes are there

 

the scant internet consensus is "marine". But military pops up also.

No idea on the extra vacuum holes.

 

Hey Mark, there was an old thread on these several years back where the unofficial decision was that they were military or possibly marine. Apparently the M114 was 283 powered and utilized some aluminum components according to someone on the tri-five Chevy forum who posted a picture of one of their engines.

 

Here’s a military gm v8
The extra holes by the thermostat housing are for picking it up
There’s a vacuum line coming from the intake runner. Or looks like it under the other lines.

 

https://www.jalopyjournal.com/forum/threads/question-about-chevy-intake.1033865/

 

thanks Anthony!

 

Internet rumors are a date code located under the heat shield.
Rumors

 

M114 info.
Engine diagram shows the ports in the intake

not very good engine pic

But the 2 holes next to the water neck and extra bosses behind the carb can be seen with stuff bolted to it

 

https://en.wikipedia.org/wiki/M114_armored_fighting_vehicle
Chevy tank. Needs hot rodded

 

Not a rumor!

 

I bought two of these pumps years ago, they were also described as being from a military application. No snowflake so they weren’t cast by Winters, but can anyone shed any light on the origin? I’ve done some prep work for polishing, it showed having been sand cast.
Two things in particular are different, the bypass hole on top is only 3/8-NPT and there are two 1/2-NPT (heater?) ports also.



Bill Jenkins said it was military in one of his books.


I just noticed another detail, the bypass hole to the No. 2 cylinder was blocked.

 

I’m looking at the carburetor bolt pattern, What carb was used? Just curious.
Dan

 

Thanks

 

Neat!

 

Rumors are Steve Mc Queen was in the Marine Core, assigned to a tank, tried to hot rod the motor and it blew up, lost a stripe over the deal Did you find that tank and are adding to your collection?

 

https://www.hotrod.com/news/the-m114-reconnaissance-the-camaro-of-tanks

Anyone recognize the head casting symbol?

 

Same engine in the M116 husky, aluminum hull amphibious troop carrier. I had one back in the 80's missing lots of parts so I moved it on.

 

I can’t help with the head ID but the water pump in that picture has the same ribs as my aluminum pump verifying an original military application.

 

Too bad Gimpy no longer has access to the GM inside info.

 

When I was a wee little lad in High School (class of '67) working at the Richfield station in town, there was a guy with a yellow chopped '32 5w with what was claimed to be an original '57 Vette 270HP motor. My Corvette buddy pointed out the twin towers on his heads and commented on how rare they were. I have seen little info on the internet to corroborate.

 

interesting
and not all runners have them,
only every other in firing order.

must be to run multiple bells and whistles

 

Casting number on this is 3743056.....58' 283.
* Edit: The 1959 parts book lists 3743056 as a 2 ton truck head.

 

I've had more than one swap meet seller insist that because this intake is aluminum, it just HAS to be from an early Corvette.

 

I would be interested in exactly which carburetor was used for my records.

According to the Carter master carburetor index, no WCFB was ever sold to Chevrolet specifically for a 283 military engine.

The contract for the M114 was signed in 1961.

Carter had a couple of WCFB's around that time with 283 applications: 2818s (S/T) and 3059s (A/T).

The index also listed number 3058s which was assigned Chevrolet part number 3796894. There is no record in the Carter index this carb was produced, nor is there an application suggested. There are no catalog pages, and if a TFN exists, I don't have it.

Of course, there were also the dual quad WCFB's but I didn't list them.

Anyone have a copy of the military TM for the M114? Reprints are available on ebay, but I really don't need another book just to get a single part number.

Jon

 

This came up in a military site for a part number

Guy was asking what carb for a 1965 m114
One place list a teapot carb. I think that PN comes up one of those

kinda looks like one in the previous pics posted

 

Thank you Anthony.

That makes a lot of sense. While the haystack Holley seems to be almost universally despised on this forum; the military used quite a few of them due to their reliability.

Unfortunately, Holley does not list most of their military carbs in their master index; and the last military Holley TM to my knowledge was printed in 1953 ?

Just thinking out loud, I don't remember a haystack Holley with the rectangular bolt pattern; they were the early 3 3/4 x 3 7/8 (almost square).

Jon

 

Thank you Mark.

After further review, to quote a sports cliche, I have a listing in my database for a haystack Holley type 2140-SG, list number R-1960-1. superseded by R-1960-2A for the Chevrolet military 283. The Chevrolet number is 3823489, which agrees with the post by Anthony.

For those not familiar with the "SG" suffix, it meant "with governer".

EDIT: and after even more review (my records show I fabricated several kits for these about 25 years ago), the R-1960 (both the 1A, and the 2A) use flange mounting gasket 8R-634 with is the thicker version of the 3 3/4 by 3 7/8 bolt pattern.

I wonder if an adapter plate was bolted to the intake ???

Jon