Ok, your going to make think again. My first impression is no, not because it wont fit, but because of how the oil flows in the engine. You see the EVO, at least the early ones had 3 distinct pressure zones that help oil move around the engine. Yea I know it has a pump and it applies pressure and so forth. But, the motor also scavenges that oil too. And how the motor breathed its crankcase pressure plays a role also. Your 87 vented through that closed off chamber, if you notice, there should be a tube in your older cam cover. Some have a plastic oil seperator stuck in it. Thats that funny shaped black thing. If you put on a newer style, that chamber doesn't get sealed, and the crank case pressure, although some will still exit, some will escape back into the cam cover and into the push rod tubes and back into the center of the cases and on, this will upset those 3 zones I have spoken about. Additional crankcase pressure will not only upset the oil feed and scavenging system but will cause you to lose horspower. Any pressure under that piston takes away from all that push on the piston you paid so much money for. I really would have to sit down and think about all the differences in the pressure zones (so to speak) in the 92(late) and later models (head breather) verses the pre 92 case breather, but pretty sure you need to stay with the old style.
If its too loud
Your too old
Last edited by Jeff S.; 03-04-2005 at 01:47 AM.
Reason: remembered some more