Rookie mistake

I'm a computer genius, mechanical no, but i've found every time I had to redo something I found a catastrophic failure waiting to be launched. I triple check everything I do on the internals. PERIOD.

I stare at the engine thinking about everything I've done for hours, because I am not sure the timing chain / water pump / oil pump replacement job I did was perfect.

I turn the engine by hand to hear it breathe. I pull the distributor cam to see it build oil pressure. I'm very thorough when it comes to hundreds of hours and money clanking into scrap.

Every time I found small errors, I found bigger mistakes that were catastrophic to the engine, waiting for me to "fire it up" in haste.

Crap in the intake, loose or missing bolts, fuel leaks, and more waiting to blow up because I worked on this thing for YEARS and all I wanted was for it to run.

Patience and observance, if its a bad sound, shut it down! Look for the problem, it's always something simple, its just a billion simple things.