Ordered a long block V-6 rebuilt engine.
Showed up quickly, and appears well done.
1 call to tech support was OK, not the best advice was not bad
The real issue came when it was time to return the core. Cust support said to send the block back, said shipping was my problem and it would be cheaper to dispose of it locally. ATK (the rebuilder) arranged for pre-paid return shipping, Issue solved by me and a bunch of phone calls.
The real reason for the low rating is that I reviewed this item on the Summit web site and they blocked it. Apparently they only publish positive reviews. It make me question their integrity.