My 96 4.0 ohv is dieing. She has little power left in her and with 200,000 miles on it, it's understandable. So time for a rebuild. Many ideas are going through my head about what to do. I want the 422 cam pretty bad, but as a college kid, I'm on a budget. So most likely (unless I win the lottery) I was looking at the 410 cam and just going with an "extremely" mild rebuild. I was looking at the rpm machine master rebuild kit: http://www.rpmmachine.com/shop/index.php?l=product_detail&p=777 along with the 410 cam and boring the block out .20 or .30. The RPM rebuild kit includes Pistons, Rings, Gaskets, Cam Bearings, Rod Bearings, Main Bearings, Oil Pump, Timing Set and Wrist pin Bushings where applicable. If doesn't include the cam, lifters, or the timing set guides or tensioners. From reading tons of opinions on here, it seems that the heads on explorers aren't that great, prone to cracking. What about after market heads from Alabama Cylinder Heads? Worth the money? As for lifters, should they be replaced during the rebuild with the Sealed Power ZHT2244 lifters? On the kit, lifters can be added for $241. As for valves, should they be replaced? If so, SI vales or sealed power? I'm new to engine work so any comments or suggestions or advice is greatly appreciated. My girlfriend's dad will be helping me on the rebuild and he has done plenty of engine rebuilds. He is pretty knowledgeable on engines, just not this one.