Just pulling apart 408 bracket motor. 12-1 Ft cam ported Eddie heads. Broke motor in with Amsoil 30wt breakin oil. He ran the 20-50 zrod oil. The bottom of the oil pan had a blob of sludge in it jelly like. It was about 1/4 quart of oil. Should have taken pics but didnt. Is it from avgas and running to much jet in carb rich? I am a Amsoil fan just a little shocked