Update;
Going to 572-13 cnc385 heads. Also step 2 1/8 to 2 1/4 to merge collecters for headers from 2 1/8 to 4 inch collecters headers. I figure the two changes give me a shot at an honest 1,000 hp or more. Add that to a weight reduction to 2890 race weight, and it may go sub 8.50s?
