Help Identify this Int/Exh Manifold (1 Viewer)

[Spike Strip]

Came across this NOS 2F Manifold combo and it was unusual to me because it does not have the emissions stuff or what I've seen on US-spec parts. Also, it has not been machined for a 'warm up flap' to direct heat to the underside of the intake which leads me to believe it must be ME spec?

Any other opinions?

 

[Spike Strip]

Cupola more:

 

[Mace]

I was always under the impression that the warm up flap reduced hot air to the intake..

 

[Spike Strip]

When ambient cold, hot exhaust is directed to the underside of the intake, speeding warm ups and aiding vaporization. The thermo-spring expands when warm and moves the flap to direct exhaust to/out the down pipe... At least that's my understanding, until corrected

 

[Mace]

Exactly, without the flap, hot air will always be routed to the intake manifold..

 

[Spike Strip]

Without the flap I would think there is no directed flow.

But my understanding of the Bimetal spring was reversed.

 

[Mace]

So, if you take the flap out, you always have hot air hitting the intake..

Regardless, I have seen a intake manifold like that. But for the life of me I don't know where..

 

[Spike Strip]

No machining for heat shields, either...

 

[Mace]

"cold" weather package?

 

[Tysano]

Cupola more:



View attachment 1553675

View attachment 1553677

looks like the stock equipment that's on my 78 with federal emissions

 

[65swb45]

PCV hook up and PN are a match for 75-78. Lack of the butterfly? News to me. Maybe JDM.