Well, the LS1 is not painted at all. All natural aluminum.
2nd, don't tell the guys at MTI in Houston,
www.morganmotorsports.com or ARE Racing in Canada that these engines can't be built to go.
Some guys who just installed a cam into a stock engine, are turning in the neighborhood of 360rwhp. That would be over 400 at the crank.
Dave, the heads won't warp. As any of the people above about these engines.