Since it's GT I suspect it's a custom odd-fire (common pin) forged crank. I don't think an even fire crank would last to ~8k rpm, there's just not enough meat between crank pins on 90* V6's. Only a 60* V6 would last at those kinds of rpms as an even fire forged crank ( I just loved how my 2.8 german capri used to rev out)