I have a set of stock (never been shaved) 454 heads. They are castings 353049. Does anyone Know how many CC's these heads are? I'm trying to choose the correct speed pro pistons to get me 10-1 comp. I know these aren't the best race heads, but this is my first jet boat and I don't want too much speed. Oh and another question, do the stock 454 rods hold up to the abuse of the high RPM's that a jet boat requires? Thanks for any help!!