Mystery Part During Engine Swap (pic)

[jamesjk]

I'm currenty swapping my dead engine out of my '87 corolla for a Japanese engine. The orginal engine is a 4A-LC and the new engine is a 3A-C. The new engine is from a tercel, but I've been told by several people that it should swap in with no issues. So far this is been true. It's probably nothing important, but I came across a part on the new engine that did not exist on the old engine and I don't know what to connect it to.

Description of the part:

It looks like a large diaphram with one vaccum connection. It has a metal arm that extends into the valve train area. The metal arm is connected to a bar that pivots a vane in each of the exhaust ports.

The part was bolded onto the side of the head next to a coolant port. The old engine didn't even have holes for this thing.

BTW, it looks damaged-- the vaccum port is busted off. Doesn't look cheap. Maybe I can ignore this thing?

What the heck is it?

[grasshopper1g]

egr valve? i think

[jamesjk]

Nope, not an EGR; that part is already accounted for. It doesn't show up in the repair manual for the corolla, but it might be a tercel only part.

[REN69]

From 4AC to 3AC... wow from better to worse.

[driftmagic1]

does it have any vacum ports on the other side that i cant see

[jamesjk]

No, there is only one (broken) port on top/side. It facing away in the pic, but you can kinda see it.

Better to worse? It's the exact same engine sans 0.1 liters. I probably won't notice any performance loss since the old engine was running so bad and I should get better gas milage.