Yep, almost everything is different. Head, valve cover, injection setup, exhaust manifold, cam, pistons, breather setup, etc. The swappable parts are: block, crank, rods, distributor, oil pan, all timing belt parts, water pump, thermostat housing, not LX or GT related, but early escorts have a different lower radiator hose than later ones. Not sure when the switch happened. I prefer the early ones myself.
Aside from the engine itself, you'd need the VAF sensor and intake ducting, the higher pressure fuel pump, and at the least to splice the wiring harness, otherwise you'd have to install an HO harness for the car as it's slightly different. The HO ECU would also have to be used. Everything else would bolt up just fine. If you're handy with a soldering iron, you'd be good to go, unless that's counted as "aftermarket."
yeah it would be aftermarket cause we can only run what came in it when it rolled off the show room floor but i was going to try to slide in a few things off an HO if they bolted up the CFI like the thottle boby or cam something easily over looked but from what yall are telling me the spec guys would have to be blind to not tell that i've done some mods to the car
You can definitely use an HO cam in that CFI. Most like yours is a roller, so you'd have to find an HO roller cam...should pick up a little power. That would be very hard to check for cheating, too, unless they measured valve lift. There's also no way to check for head milling, which would also give compression increase.
I beleive that if a car leaves the showroom as an LX and is converted to a GT should still be considered legal. My 4 door has a full GT powertrain conversion plus a little extra, teched on a regular basis, no problems.
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