Smog pump delete..what size bolts behind the engine block? And h-pipe how to?

You need thermactor plugs to close off the back of the heads. Ford sells them for about $15-$20 . Part #F4ZZ-6E086-A.
To block the pipe in the h-pipe you can just cut it off and bend it over or weld it closed

Pokageek said:

Hi All,

Anyone know what size bolts to plug the holes on the heads behind the eng block? Also, what's the best way to plug that h-pipe tube that usually goes to the smog Sheeat?

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i left the tubing that goes to the back of the head and just removed the rubber hoses from the passenger side. i used a rubber bypass plug from the HELP section of the parts store on that, then i got out the rotary tool and cut off the pipe going to my prochamber and i put the other bypass plug over the opening in the prochamber. when i do the head swap i will take care of those other lines going to the back of the heads. either way good luck.