I have a 96 4X4 Blazer 4.3 V6 I just started to notice that my motor is ticking everytime its at higher RPM, it ticks faster at high RPM, when it's in park it ticks slowly. whats the problem?

 

Check your oil?

Could be valvetrain noise.

 

^ yep.
Depends on where the noise is coming from. Howver if it is in time with your engine rpms, typically its a valve. Like posted above, check your oil level and type.

You may need to run some seafoam through your oil system, although I prefer Marvelous Marvins Mystery Oil. Read the cans on each.

 

it went already, oil pump is gone, rods are twisted, bearings gone, crank is gone. need new bottom end.

 

bummer.
I see you started a thread on a possible engine to replace it with.