Fresh 383 burns up pistons
had a 383 stoker built for me a few weeks ago, iron vortec heads, 10:1 speed pro pistons and eagle crank etc. Well swapped it into my truck and put about 90 miles of driving here and there and started blowing oil out of the breathers severely. Checked compression and had two cylinders at normal around 175 and the rest were pretty much junk, around 30-80. Well sent the motor back under warranty and heres some pics of the damage. He first accused me of using NOS which I never have and probably never will. He believed me and is covering all the parts/labor but my question is what could cause this much damage?
engine never overheated
had consistent oil pressure
my spark plugs read normal
headers never got excessively hot
and I have a brand new holley 750 on top with 7psi supply giving it plenty of fuel
the only thing I did before it started blowing oil out the breathers was mess with the timing with a different timing light, cause ignition timing cause this much damage in such a short time?