'84 2.8 A.I.R. pipe/exhaust manifold bolt?

[APF1984BII]

As I posted in the BII section of The Ranger Station's forum, I have the left side head back from the machine shop, ready to go back on the engine in my '84 XLT BII. I have been able to remove the rusted-in headpipe studs, O2 sensor and broken-off stub of A.I.R. pipe. I have the retaining bolt for the pipe drilled to where I can start punching the threads out of the manifold, but it's going to take a tap to clean them up so I can reuse the hole. So, the question is, does anybody know offhand the diameter and pitch of that bolt? I haven't decided whether I'm going to return the engine to stock or do the emission control delete with the distributor and carb swap, but I'd like the manifolds to be ready for either one. Thanks in advance - Chris

 

[APF1984BII]

Got the right side exhaust manifold off yesterday and pulled the A.I.R. pipe/check valve retaining bolt out. Took it to work today and used our diameter/pitch plate to determine it's an M8x1.25.