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On all emission compliant heads there is an EGR passageway that is cast or drilled lengthwise near the exhaust ports inside the cylinder heads. You must plug these passageways for it is raw exhaust being expelled from the openings instead of being directed out the headers. Your local Ford dealer has the correct plugs that are 5/8' or 1/2" (?) diameter coarse thread with 7/16" diameter internal threads. The plugs are about 3/4" long and have threadlocker pre-applied to them. The plugs are used on each end of the cylinder head to plug up the passageways. The internal threads are used to hang the accesories from such as air conditioning, power steering or alternator.
This is just a small oversight on your part, no big deal.
Rick
PS: If the dealer doesn't have the parts or tries to "hold you up"
(should be about $3.00-$4.00 each) you can use allen head set screws (tractor supply or machine shor) with locktight on them.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 11-26-2004 at 01:15 PM..
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