Well, an all aluminum engine, and compressing air, sure does "lean" to the conclusion heat soak might be a problem. I have to come back and thank Rob, and Woody for all their work as well, and a host of others not mentioned working off their own assumptions. All that info and data is sure narrowing down what is a good mod, and what isn't. So, you can better spend the $$$$$ in the right place. As someone who would love to stay with the drag racing, soon to go 1/8 mi only next year...it's all good info...even when you get some who think they know this motor and don't...everything I have bought and installed on the cars so far has had a benefit...and I love that part...