New Dart SHP burns bearings
New Dart SHP block, all new rotating assembly, roller cam, Crower roller lifters. Top end is Dart aluminum heads w/ T&D shafts. Kevko 1097s pan and 10552 pump. Motor was broke in and all was fine. Track packing and hotlaps was good - good oil pressure and water temp. Started last in heat, finished 3rd. Third lap of the feature it explodes. Rod came out front left of block. Looking is crack journal that can be seen are burnt up. Bearing clearances were good when put together so that is not the problem. Main torque was per install paper that came with block.
As mentioned this block was brand new. It came "ready to assemble" - bored/honed to 4.155, cam bearings installed and freeze plugs installed. I put in the 1/8" plugs in the lifter valley and the 1/4" plugs in the back, front, oil filter boss as the install paper called for.
I have the feeling I messed up by not using restrictor plugs in the front 2 that are for the lifters. Everything leads to it being that. A search (that has came too late) shows Moroso sells a plug kit and says it for use in the SHP when using roller lifters, but some other tech sites say to never restrict this block. The tach was at 7800 and it exploded middle of back straight - let me add that it had no oil leaks prior - which leads me to believe that the oil was all up top starved the front of the motor, regardless of the priority main oiling that block has.
Any thoughts?