Can anyone tell me what this thing is?

[Caffeinephreak]

Originally Posted by Bigdav160

Oldsmobile?

AIR injection ports for secondary air.

Originally Posted by Caffeinephreak

Im not sure what it came out of i believe its a 65 250

I Did some more digging and it sounds like you may be on to something the block code matches the olds.

[Steeveedee]

Looks like Bigdav160 got it. If there is one plug at each exhaust port, they are in the position where the Air Injection Reactor pumped air into the exhaust to help with more complete burning of the exhaust when the choke was engaged. Once the truck warms up enough, the thermal vacuum switch opens and the system freewheels.

That system began to be used in '66 on many vehicles.

[Caffeinephreak]

Originally Posted by Steeveedee

Looks like Bigdav160 got it. If there is one plug at each exhaust port, they are in the position where the Air Injection Reactor pumped air into the exhaust to help with more complete burning of the exhaust when the choke was engaged. Once the truck warms up enough, the thermal vacuum switch opens and the system freewheels.

That system began to be used in '66 on many vehicles.

Cool thanks guys I stripped one trying to get it for a cleaning nice to know it doesn't really matter anyways.