If you swap the heads, go w/ the 2001 heads because they are Romeo heads instead of Windsor heads and will bolt up easier. You will be able to keep you stock head covers among other things that would add up in cost if you go w/ 99 or 2000 heads.The head swap is becoming a regular thing for the Thunderbird guys and I can't believe that more 96-98 mustang guys haven't picked up on it. The new heads will outflow ported heads, but why not just port the new ones before putting them on. Another thing to think about would to just get a whole 99+ motor and swap that in. Many people have been finding these motors w/ 10,000 miles or less for less then $1500. Best deal I have heard so far was a 2000 w/ 4,000 miles for $950. Why not just throw in an almost new motor? The 99GT and up motor is the way I am planning to go in the future w/ my Tbird.
Some people say go w/ NOS, but wouldn't you rather have HP and Torque all the time? I would. There are a few article about swapping in the other heads on the net, I would just try to search for one. BTW, you can pick up the heads complete w/ cams and all that for around $360 each new!
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1997 Thunderbird 4.6L: Black w/ grey leather Ram Air w/ K&N, FMS U/D pulleys, FMS 9mm wires, Dynomax exhaust. Soon: custom burned "Inject tech" chip, trans-go shift kit, 28,000GVW trans-cooler
No Longer own: 91 LX 5.0L 5 spd Red w/ black interior
2 chamber flowmasters, Bassani off-road X-pipe, MAC cold air induction, Kirban short throw, Heavy duty 3 core radiator, FMS 3:73's, Timing bump to 14 degrees, SRP billet racing pedals, Kenwood sound system
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