Sorry for not posting this information sooner, just wanted to be sure it was ok to do so. I spoke with Dave Tatom, the man who built the motor in the $400g Zephyr at Scotsdale last year, and he said these are the same heads and intake he used on that car. Kearney Pattern Works and Foundry 40s.Montgomery Street San Jose,Ca. 95110 408-283-7414 If you are interested I suggest you call them and have your name put on their list. They are making ten sets and 5 sets are spoken for. Zephyr41