a ls1 N/a has run 8s and there is a ls1 that has run 6’s Turbo’d and plenty of em in the 7s and some of em still run stock style suspensino in the 7s
lsx motors have some of the best flowing heads stock, and only get better in the aftermarket
you can make a ls1 into 447 cubic inches and there is a 454 world industires block which can be made even bigger that is a lsx