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There are several possibilities:
1) Your camshaft is worn (rare, it would have to be on a destroyed engine de to lack of oil) - Replace camshaft and overhaul engine
2) Your rockers are too tight and have caused damage to the pushrods and hydraulic lifters) - loosen them, remove them, remove the pushrods and roll them on a piece of flat plywood or glass to check them for bends).
3) Hydraulic valve lifters "blown" these devices fill with oil and hold pressure to "push" the valves open, if they are blown (do not hold pressure) they will not be strong enough to compress the valve springs, - "Fish" your valve lifters and fix them (it is easier to replace them).
4) Your distribution chain is broken, remove the water pump, behind it there is a metal cover, this covers two sprockets, one is twice as large (the camshaft one) as the other (the crankshaft one), there is a chain which joins both sprockets, just like in a bycicle, if it is broken, replace it, time the engine, (by aligning the marks on the sprockets) and try runnng it.
If the case is 4, your valves might be bent, sometimes the pistons hit the valves if the chain brakes, bending the valves.
5) lack of oil pressure, your oil pump is shot or your engine is blown.
There is also the possibility that your rockers are too loose, but that will generate a loud clicking noise, you don't mention the noise, so I assume that is not the case.
Good luck
What else can I help you with?
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