Switched from Scumacher try-Ys to Pro Parts step headers.

abodyjoe said
would have been nice to see what just changing the headers did, then the carb.

1.63 60 ft. to a 1.549 60 ft. is a pretty big drop.. that from the carb change?

I can't say how much of the gain was from the headers and how much was from the carb main body. My guess is that at least 80% of the gain is from the headers.