So I had speedmaster heads and also switched to trick-flows. With the speedmaster best 1/8 mile was 7.07 and 1/4 was 11.35. Both those numbers were with 1 5/8 headers. When I switch to the trick-flows I also went to 1 7/8 headers. Best 1/8 is 6.84 and 1/4 was 10.96 running out of gear around 1000' last year.
