What is this pipe that connects the two heads?

[red85]

What the hell? No one has some old spark plugs lying around? They're free. They thread right in They're free. Why are you guys trying to reinvent the wheel and make extra work? Oh, and did I forget to mention that old spark plugs are free?

 

[wade]

It's on the backside of the engine, how is it going to affect the room of the cooling fan?

But, still could inhibit set-back. FEAD and cooling fan might need every bit of room you can give them.

The "inch" (or so) that the Thermactor Tube takes up on the rear of the block is just an "inch" that the engine could be set back toward the firewall.
Giving you more room at the front for FEAD (Front End Accessory Drive) and Fan clearances. Does that make it easier to understand?

 

[Hibs]

ah gotcha, didn't catch that the first time i skimmed through it.

 

[bottledgt]

spark plugs arent right but ive used em in a pinch with some silicone.the threads are a little small but work if you dont crank on it too hard. but even with the porcelin broke off i wouldnt try that in a bronco II. itll be tight enough without adding more shit back there. the plugs from ford are best