MustangWorks.com : Ford Forums - View Single Post - gt-40p and thermactor drilling...How?

Jeff Chambers · 11-20-2002, 07:47 AM

The P's aren't drilled from the factory. The EGR passage is probably a remnant of the original design and casting molds, but since the later model Explorers didn't use the thermactor passage, Ford simply cut one of the last production processes which was drilling of the crossover passage as a means of reducing cost. The Explorers took the injected the air directly into the exhaust manifold instead of through this thermactor passage.

Personally, I wouldn't drill it even if I lived in CA. If the smog police want to see the cross-over in place, then just simply bolt it to the back of the heads.

11-20-2002, 07:47 AM	#8
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	The P's aren't drilled from the factory. The EGR passage is probably a remnant of the original design and casting molds, but since the later model Explorers didn't use the thermactor passage, Ford simply cut one of the last production processes which was drilling of the crossover passage as a means of reducing cost. The Explorers took the injected the air directly into the exhaust manifold instead of through this thermactor passage. Personally, I wouldn't drill it even if I lived in CA. If the smog police want to see the cross-over in place, then just simply bolt it to the back of the heads. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"