You have to make sure the engine is at top dead center on number one cylinder (all valves closed on number one cylinder) - if distributor installed check that #1 is on firing position so is not on exhaust stroke and or remove spark plug and put plastic straw in hole to see if piston is at TDC (top dead center) ready to fire on compression stroke.
After setting timing always rotate engine 4 times to bring back to same location and that nothing like pistons bump into valves etc. and make sure that timing marks are at the location. If you install backwards on some engines the oil pump will not be in line to accept oil and will not get oil pressure - I believe this true of 3.1 chev or was it 3.8 I messed up on, lol
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