How do i replace lifters .

That is a ridiculously high price to replace lifters on a 4 or 6 cylinder engine. On the Mitsubishi 4 cylinder motor, the only thing that is needed to do is remove the valve cover and remove the rocker rod. (2 rods which hold the rocker assembly.) Next is remove the lifters from the bottoms of the rockers and pop in the new ones. Be sure to soak the new lifters in oil for 24-48hrs prior to install so they are pre-filled before install. Replace the rocker assembly and torque down to specs. replace valve cover and then start the vehicle. Check that there is no loud tapping noise and do not race the engine until the lifters have pumped up with engine oil. You should replace oil and filter for this engine work as well.

In engines with rocker arm valve systems, the procedure I'm familiar with is to remove a rocker arm cover, and (one at a time!) while the engine is running, slowly back off the rocker arm retainer nut or bolt just until you hear the lifter tapping, then tighten it a quarter turn. If you can identify a lifter that is already tapping, tighten its rocker arm slowly until it stops tapping, then adjust it. Do not over-tighten! This can damage the engine.

Listen carefully to how the engine sounds; if it starts to stumble when you tighten a loose rocker arm, you've gone too far. If you cannot get the engine to run well without tapping, you may have too much wear in the valve train and may be due for a head overhaul, or you don't have adequate oil pressure in the lifters in question.
Repeat until all rocker arms are done. Replace the rocker arm cover using a new gasket, then (in a V-engine), repeat the procedure on the other side of the engine.

Wearing safety goggles, or better yet, a transparent face shield, is strongly recommended. Sometimes oil will squirt out a considerable distance from the lifter side of the rocker arm during adjustment, and the direction is not readily predictable.

Pull intake off pull off valve covers,loosin rocker arm bolts and remove ,, pull push rods out, after you have the push rods out you can pull the lifters out,,,,,,i suggest taking to a mechanic shop,,, if all you have is a ticking sound try this,,, buy a can of chemtol spray,,,chemtol only,,, with the little red straw for spraying,,,remove valve cover,,try to see if you can hear which lift or lifts is ticking,,,turn off car,,,loosen not remove that rocker arm,,,slid to the side,,count your turns,,,move rocker to the side,,, take chemtol spray and insert little spray straw and spray it down the hole in the center of the push rod ,, it will clean the lifter of the debris that is not letting it prime up,, repeat if nessary,, it works,,, see YOU TUBE,,, dirty oil causes this,,, put in clean oil and some lucas oil treatment to help prevent in future,,, keep oil changed ,,if it starts ticking again change oil and add more lucas,,, it might fix itself

Determining what caused sudden slack in valves would be of concern to me, as in perhaps, changed oil brand, grade or filter incorrect?
Most small block chevy's have adjustable rocker arms. Is that not the case with yours?

not a valve, but a lifter. I will paste procedure below. You judge if you can do it or not. Recommend you replace them all while you're in there. If you let this go, the lifter will wear out the camshaft. Lifters are $22 each, and you have 8 of them. You will also need a new valve cover gasket.
Please let me know if you have questions, and thanks for using FixYa.

2.0L Engine
SOHC engine
See Figures 6, 7, 8 and 9

1. Disconnect the engine air cleaner-to-valve cover hose from the cover by compressing the hose clamp with pliers and sliding the clamp back, then separate the hose from the cover.
2. Remove the spark plug wire separators from the valve cover and set the wire assemblies aside.
3. Unfasten the three valve cover retaining bolts.
4. Remove the valve cover and gasket from the cylinder head.
   

WARNING Do not use any abrasive grinding discs to remove gasket material. Use a plastic manual gasket scraper to remove the gasket residue. Be careful not to scratch or gouge the aluminum sealing surfaces when cleaning them.

1. Remove the old gasket material from the cylinder head and valve cover mating surfaces.

Fig. Fig. 6: Remove the spark plug wire separators from the valve cover

Fig. Fig. 7: Compress the engine air cleaner-to-valve cover hose clamp with pliers, and slide the clamp back ...

Fig. Fig. 8: ... then disconnect the hose from the valve cover

Fig. Fig. 9: Unfasten the valve cover retainers and remove the valve cover-2.0L SOHC engine

If removing more than one valve lifter (tappet), mark the lifters and their locations as they must be installed in their original bores.

1. Remove the rocker arm(s).
2. Unfasten the lifter guide plate retainer.
3. Remove the guide plate and the lifter.

To install:

1. The oil feed hole in the lifter must face away from the oil feed hole in the cylinder head.
2. Lubricate the lifter(s) with clean 5W-30 engine oil and install them in their original bores.

Make sure the lifter guide plate retainer tabs are towards the rear of the cylinder head, and the lifter guide plate tabs are towards the front of the cylinder head.

1. Install the lifter guide plate and tighten the retainer.
2. Install the rocker arms.
   

Do not use any sealer with a silicone type gasket.

1. Install a new gasket and the valve cover.
2. Install and tighten the valve cover retainers to 71-97 inch lbs. (8-11.5 Nm).
3. Attach the spark plug wire separators to the cylinder head.
4. Connect the engine air cleaner-to-valve cover hose and engage the hose clamp

The are inside the head. Best way to access them is to remove the valve cover and you will seem the cams, rocker arms, and under the rocker arms are the hydraulic lifters. Just a fyi if you remove a lifter make sure you put it back in the same spot. Label everything you take apart!!!

Hydraulic Lifters REMOVAL & INSTALLATION 4.8L Engines

1. Remove the rocker cover.
2. Remove the engine side cover.
3. Back off the rocker arm adjusting nuts and remove the pushrods. Keep them in order for installation.
4. Reaching through the side cover opening, lift out the hydraulic lifters. If your are going to re-use the lifters, remove them one at a time and mark each one for installation. They must be re-installed in the same locations. If a lifter is stuck, it can be removed with a grasping-type lifter tool, available form most auto parts stores.
   
5. Inspect each lifter thoroughly. If any of them shows any signs of wear, heat bluing or damage, replace the whole set. To install:
   
6. Install and coat each lifter with engine oil supplement.
7. Install the remaining components by reversing the removal procedure.
8. Once installation is complete, adjust the valves as described in the valve lash procedure. Fig. 1: Stuck lifters must be freed using a slide hammer type lifter removal tool
   

4.3L, 5.0L, 5.7L And 7.4L Engines

1. Remove the cylinder head cover.
2. Remove the intake manifold.
3. Back off the rocker arm adjusting nuts and remove the pushrods. Keep them in order for installation.
4. Remove the lifter retainer bolts, retainer and restrictor.
5. Remove the lifters. If your are going to re-use the lifters, remove them one at a time and mark each one for installation. They must be re-installed in the same locations. If a lifter is stuck, it can be removed with a grasping-type lifter tool, available from most auto parts stores.
6. Inspect each lifter thoroughly. If any of them shows any signs of wear, heat bluing or damage, replace the whole set.
7. Coat each lifter with engine oil supplement prior to installation. Tighten the retainer bolts to 12 ft. lbs. (16 Nm). Adjust the valves as described in the valve lash procedure.

6.2L And 6.5L Diesel Engines Fig. 2: Diesel engine valve lifter

1. Remove the cylinder head cover.
2. Remove the rocker arm shaft, rocker arms and pushrods. Keep all parts in order and properly identified for installation.
3. Remove the clamps and lifter guide plates.
4. Remove the lifters by reaching through the access holes in the cylinder head with a magnetic lifter tool. If you are going to re-use the lifters, remove them one at a time and mark each one for installation. They must be re-installed in the same locations. If a lifter is stuck, it can be removed with a grasping-type lifter tool, available form most auto parts stores. To install:
   
5. Inspect each lifter thoroughly. If any of them shows any signs of wear, heat bluing or damage, replace the whole set. NOTE: Some engines will have both standard and 0.010 in. (.0039mm) oversize lifters. The oversized lifters will have "10'' etched into the side. The block will be stamped "OS'' on the cast pad next to the lifter bore. and on the top rail of the crankcase above the lifter bore. WARNING
   New lifters must be primed before installation. Damage to the lifters and engine will result if new lifters are installed dry!
   
6. Prime new lifters by immersing them in clean kerosene, engine oil or diesel fuel and working the lifter plunger while the unit is submerged.
7. Prior to installation, coat the lifter roller with engine oil supplement. Re-used lifters must be installed in their original positions!
8. Install the lifters.
9. Install the guide plates and clamps. Tighten the clamp bolts to 18 ft. lbs. (26 Nm).
10. After all the clamps are installed, turn the crankshaft by hand, 2 full turns (720°) to ensure free movement of the lifters in the guide plates. If the crankshaft won't turn, one or more lifters may be jamming in the guide plates.
11. The remainder of assembly the reverse of disassembly.

Please don't forget to rate!!!!

2.2L Engine When installing new lifters, a pre-lube should always be applied to the lifter body. It is also a good idea to prime hydraulic lifters by submerging them in clean engine oil and depressing the plunger using an old pushrod. This allows the internal components of the hydraulic lifter to coat with oil before initial operation in the engine. All lifters should be replaced when a new camshaft is installed.
If any valve train components (lifters, pushrods, rocker arms) are to be reused, they must be tagged or arranged during removal to assure installation in their original locations.

1. Remove the rocker arm cover.
   
2. Remove the cylinder head assembly from the engine.
   
3. Remove the bolts retaining the lifter anti-rotation brackets, then remove the brackets.
   
4. Remove the hydraulic roller lifters from the bores.
   
5. Inspect the lifter and lifter bore for wear and scuffing. Examine the roller for freedom of movement and/or flat spots on the roller surface.
   

Remove the bolts retaining the lifter anti-rotation brackets ...



... then remove the anti-rotation brackets



The lifters are located in bores in the engine block



Use a lifter removal tool to remove the lifters from the bore

To install:
If installing a new lifter, coat the lifter body with a suitable camshaft pre-lube

1. Install each hydraulic lifter to its bore being careful to align the flat sides (top) of the lifters with the flat sides of the anti-rotation brackets. When properly installed the flat sides of each lifter are aligned parallel to the anti-rotation bracket. The roller at the bottom of the lifter is parallel to the camshaft lobe.
   

Make sure to properly align and install each lifter as improper installation of the lifters or brackets could result in engine damage.

1. Install the anti-rotation bracket retaining bolts and tighten to 97 inch lbs. (11 Nm).
   
2. Install the cylinder head.
   
3. Install the rocker arm cover.
   

Removing the hydraulic roller lifter from the 2.2L engine

not hard and no dont need to remove intake will have to remove some things depends on which side your working on like air intake hose a wire or two might have to unbolt a/c/ if u have- could be rocker also check for dry push rod ,weak valve springs worn valve guide-

Get you a new gasket for the rocker cover, make sure you clean the mating surface good,and all traces of old gasket, and silicon etc. make sure you dont overtighten the bolts to the rocker cover. the torque for the rocker cover is 35 in lbs (4nm). as far as vavle clearance it is none adjustable. A clicking valve can indicate worn lifters, sometimes an oil change will quiet down noisy lifters. If noisy lifters persist you would have to service the heads. If you decide to do that yourself you can ask for a procedure on that too later on. Removal of the head is very difficult, because you need to remove a lot of things, and require you to do a timing on the engine.