From a build thread...
Found an interesting article here for the mustang crowd:
http://www.veryuseful.com/mustang/te...orer65mmTB.pdf
The next step for me was to deal with the crankcase vent. It appears most EFI cars have a nipple on the oil fill going to the throttle body. This allows the crankcase to be "vented" yet remained sealed.
EFI motors must be sealed, ie all air must go through the MAF so the computer knows how much fuel to add. If the crankcase was vented to open air (like mine was) then air could technically get in the motor and mess up the fuel/air ratio. At least what the computer thinks the ratio is...
So I had three options;
1) just cap off the nipple on the oil fill- have seen it done with unknown effect
b) run a hose between the oil fill nipple and the stock explorer air tube (some stock explorers are vented this way, mine was) or
III) drill out the boss on the TB and put a port in to run it in stock 5.0 fashion.
Some explorer TB will have the port already, mine did not.
I choose to add the port to the TB. I had a junk TB sitting around from the bellcrank swap ready to be used. I inserted a screwdriver into the port on the junk and with a couple of twists it came right out!
Next I centerpunched and drilled out the boss. I started with a long skinny step drill bit with long gaps between sizes. I carefully went up to 3/8". Once the first 1/4" was drilled out to 3/8" I switched over to a standard drill bit so I wouldn't drill the hole oversize with the step bit.
I mixed up a little JB Weld and let it sit for the night. In the morning all looked good until the TB slipped out of my hands. It didn't fall far but enough to jar loose my newly installed port
The port came off with the paint that was on the boss. I think the JB didn't like being attached to the POR 15 and then to the aluminum. I am going to try again directly to the aluminum. If that doesn't work I will just tap it and put a threaded fitting in!
