I had 3 (three) Jasper remanufactured GM 5.3 engines installed in a 2004 Silverado.... in less than 1 (one) year. All engines were installed by a shop who is a Jasper vendor, and proudly has the Jasper sign displayed on the front of their building.
First one had a collapsed lifter, right out of the crate. Second one either had a bad head or a bad head gasket, and was losing coolant, right out of the crate. Third one is still under the hood.
Apparently, that thing called 'quality control' is a difficult thing for them to figure out. When they can't figure out how to successfully rebuild an LS engine.... they've got issues.