op is NA so no biggie but there was a guy selling gm reman test motors (long blocks) off ebay a while back listed as turbo motors and these things had 40-60 over and 30 under mains ....these were not actually rebuilt by GM but for GM and the tags were stamped with the specs
the 60 over isnt the real problem for turbo its that the pistons are junk cast never meant to be in forced induction and ring pkg stinks , and 30 under cranks wouldn't be a big deal but the cranks weren't turbo cranks