Alec,
I bought these from Dean a while back - here is what was done and info on 95+ OHV...
"I have a set of performance heads for the 91-94 4.0 OHV Ranger or Explorer Motor for sale. They will bolt up to a post 94 model 4.0, but the compression will be lower than stock. (My guess would be 8:1 insted of 9:1). This reduction in compression would be perfect if you are planning on building a blower motor with a late model shortblock.
These heads have over 1000 dollars worth of parts and labor in them. This is not including the cost of the core heads themselves. The original receipt comes with the heads, and I can scan it and e-mail it upon request to anyone. I can also take pictures of the heads and send them to those that are interested.
Heads feature:
Port and Polish Job
3 Angle Valve Job
Polished Combustion Chambers
Comp Cams Dual Valve Springs
Aftermarket Stainless Steel Valves
Aftermarket Valve Locks
Hardened Steel Valve Retainers
Viton Valve Stem Seals
The heads were professionally built for a supercharged motor, but they will work fine on a N/A truck. They have less than 500 miles on them, and work fine."
Let me know if you want them!
J