I won't so much argue about going mass air, but I will mention that people with GT40/40P engine swaps and the speed-density computer have very mixed results. A couple people have had modified HO motors run great, others didn't have such luck. I was one of the latter group. It runs spectacular with mass air though.
The GT40 and GT40P heads do not have air inejction ports. Nobody cares about this, its basically useless. The EGR will work just fine, provided you have an intake with the EGR passage in it. Later Explorer intakes do not have this. EGR isn't critical unless you get smog checked. Without it, you'll have higher NOx emissions. Its also good for a teensy bit of fuel economy if its working right, though I frankly doubt you'd notice it in any real way. It shuts itself off under heavy acceleration, so it doesn't cost any power either.
The plug issue is mostly a non-issue. You need the headers that are compatible with those heads and it fits like a glove. They are a little more expensive than cheap-ass headers, but frankly cheap-ass headers suck anyway. They're prone to warping or just not being made properly so they pop gaskets and leak and stuff. I have a set, and I had to get them milled flat to keep gaskets on the car. By the time I had all that done, I could have just gotten better headers that worked right out of the box. That said, having them milled turned a quarterly header gasket replacement into a job I haven't done since I rebuilt the engine last time, which was like 7 years ago.
The GT40 and GT40P heads do not have air inejction ports. Nobody cares about this, its basically useless. The EGR will work just fine, provided you have an intake with the EGR passage in it. Later Explorer intakes do not have this. EGR isn't critical unless you get smog checked. Without it, you'll have higher NOx emissions. Its also good for a teensy bit of fuel economy if its working right, though I frankly doubt you'd notice it in any real way. It shuts itself off under heavy acceleration, so it doesn't cost any power either.
The plug issue is mostly a non-issue. You need the headers that are compatible with those heads and it fits like a glove. They are a little more expensive than cheap-ass headers, but frankly cheap-ass headers suck anyway. They're prone to warping or just not being made properly so they pop gaskets and leak and stuff. I have a set, and I had to get them milled flat to keep gaskets on the car. By the time I had all that done, I could have just gotten better headers that worked right out of the box. That said, having them milled turned a quarterly header gasket replacement into a job I haven't done since I rebuilt the engine last time, which was like 7 years ago.
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