With the new chain on and the tensioner out, it hangs past the crank sprocket enough for the crank to rotate, and enough for the rollers of the chain to come unseated from the vallies of the crank sprocket teeth.
If the tensioner is installed when the chain rollers are above the teeth on the sprocket instead of above the vallies, when the engine is started, it WILL skip several teeth. It is quite obvious this is what happened.
I was even able to repeat this several times rotating the engine by hand without touching the chain. I even conducted the experiment with the old chain before i took it off. I had the exact same results with the new chain.
The sprockets looked practically new. If a completely stock engine needs a new sprocket set or timing chain at 65k, that is a serious design flaw, and I mean very serious. Timing chains typically last the life of the engine, and the sprocket sets should too. I'm talking 200,000+ miles.
The only reason why the chain would stretch excessively or excessive sprocket wear occuring would be due to modifications:
-stiffer valve springs
-higher lift cams
-basically anything that allows the rpms to accelerate faster like an aluminum flywheel for instance
1999 Chevrolet Corvette hardtop 6spd
1998 Volvo S70 T5 Turbo auto
2007 Chevrolet Cobalt SS/SC