The Luv's G180 1.8 engine is an overhead cam engine and it doesn't even have lifters, but I'll sell you some for it if you want. For a large fee of course. I have them on a shelf right next to my spare muffler bearings.
J/K ...lol
Like I said before in another post, if you wanna know about cams, give Delta Cams a call. They are the experts.
But before you try to replace your cam, get out a manual for your truck and read the instructions first. If you don't have one - you better beg, borrow, or steal one...lol
Then the procedure I use is this:
First get the proper piston at TDC, remove the valve cover, lock down the cam chain, zip-tie or wire the gear to the chain so that it stays in place on the chain while you are swapping out the cam, unbolt the cam gear and rocker assembly, remove your old cam, check everything for proper tolerances, make sure the locating pin for the gear is snug in the end of the new cam, use a good liberal amount of cam assembly/install lube on the new cam, install the cam and rocker assembly, install the gear on the end of the cam, remove the zip tie/wire that you used to keep it connected to the chain, unlock the timing chain, torque the cam gear and rocker assembly to spec's, re-adjust your valve clearances, replace your valve cover, and start it up keeping the idle up around 2000 rpm's for around 20 minutes or so to initially break in the cam.
Then take it easy driving it around for a few days. Next get the proper piston up on TDC, remove your valve cover, re-adjust your valve clearances again if necessary, check your torque on your cam gear and rocker assembly, replace your valve cover, and change your oil and oil filter.
Don't forget to check your ignition timing and adjust it if necessary, then pat yourself on the back, pick up your tools, shut the hood, go get cleand up to go raise hell around town...lol
Oh yeah...one more thing. A nice little trick I do when changing a valve cover gasket on my truck's engine is to take the little rubber half moons that go in each end of the head (and that the valve cover gasket sets on) and flip them upside down and apply a little silicone-based gasket sealant to the ridges so that they won't leak after you install them and the valve cover with it's gasket. A lot of G series engines have a slight leak there, and that fixes it. But don't put silicone on the valve cover gasket or it will leak. Just put the valve cover gasket on dry after you've cleaned up your vave cover and head surface where the gasket seals first.
I'm sure I probably missed something or maybe I goofed somewhere, and if I did I apologize. It's late and I had a long day. Hopefully someone else will jump in and add to this, but if they don't, if you read your manual first and keep it handy, you should be just fine.
Hope all of that helps ya! Good luck!