You sure can. I just put on on my 87 2.6L. It popped the #2 jet valve and luckily did not eject the stem into my cam or valve train. I got them for 19.95 shipped in three days from http://www.enginemachineservice.com/conquest.html (it was from ohio to PA so shipping may be more depending on where you're located).

-Todd
1987 Montero 2.6l 5-speed (Sold...but I still miss her)
2008 Jeep Patriot Sport 4x4