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yes it is a roller READY block. however it came with a flat tappet cam from factory. they started changing them in to roller blocks some time in mid 93.
i wouldnt waste my time with a 5.0 cam. the cam in the lightning is a great torque making cam and gets the truck moving. i doubt any power gains would be had putting that cam in.
There ARE other roller cams available,If in doubt about what size cam to run call Summit or jegs.If you have a choice of a big or small cam always go with the milder one,unless your dealing with a allout race car and its a real high performance issue.