Hot Rods Help ID this Tattersfield intake

Hello all. Been a long time since I posted. Hoping to get back and involved more often.
I searched the threads already for Tattersfield specific info but haven’t gotten an answer yet. Hoping to learn what this rare intake is off of. On the top of it it reads GMC DUAL. It is 2” too wide for a 216-235. And 1” too wide for a 270/302 GMC. The ports are a hair larger than on an early 216. My two trails as of now are either a Pontiac 223??? Ish from a 37-38 that was used in the 38 GMC trucks as was done back then. Or maybe gmc commercial industrial engine. But the ports are way smaller than on my 1956 302 and you wouldn’t think that anyone would make an intake like that for a big truck. What about a flat head?????
Any leads would be appreciated. Comment or send me a message. Thanks pics below.
Thanks

 

You got me curious too so I've been searching and looking around... It looks like the Pontiac six has 4 intake ports.

 

There is a BIG GMC 6 (503 cubic inches) from the 50's?

 

My GMC 302 is about 17 1/2 center of ports end to end.

 

It's for the "series II" engine that was in medium duty trucks. Nothing to do with the 270/302.

 

Gmc made truck sixes up to 707 (?) cubic inches. It's likely for one of those as said above. Ellis also made dual carb intakes for those...a buddy of mine has one

 

The series 2 engines ranged from 278 to 360 cubic inches, and the series 3s ranged from 361 to 503. In any event, I see lots of Ellis intakes for these engines, with no takers.

 

Thanks. That’s what I was afraid of. Never seen a Tattersfield for those engines before……
I’m debating shortening it to make it fit a 270, or even 235. Don’t have anything to lose. It’s just wall art the way it is!

 

They built a 702 cid V12 out of their big V6. Nothing to do with inline 6's.

 

A friend had these made for a 600 series(?) dump truck. Think it was a 318 ? Also had an Ellis on it, but he never could make it run well.

 

Yeah, I don't know anything. But you might learn something here...
https://www.jalopyjournal.com/forum/threads/gmc-big-strait-6-426-477-503-707.283473/

 

One thing that I never understood about Ellis intakes was that, while they specialized in manifolds for trucks, they never had a provision for exhaust heat. I can just imagine the swearing coming out of a trucker the first time he tried to cross the Rockies with his new Ellis dual setup, and the carbs iced up partway through the mountains.