[gata79]

Engine is a 535.Allpontiac block,HP heads,10.5 compression.55 mm roller cam Redzone lifters.We put it together a couple of years ago and it sat till 2 weeks ago.Turned over fine by hand and with starter.Just after firing it locked down.We tore it down and found powdered metal in four cylinders.Enough to wedge the piston against the head.The metal was all the way from carb to exhaust ports.We thought the cylinder walls must have rusted from sitting so long and the rings scraped it off.Pulled the engine,went back through it from start.Everything looked good just needed cleaning.Put the engine back in the car and it looks like it did the same thing.Locked up just after firing.Pulled the intake and found black powdered metal everywhere.
We didn't put water in till just before trying to crank it.There was no water in the cylinders.
Any ideas?Cleaned the fuel cell and line before the first attempt.Can't figure it out.Getting frustrated.