Quote: difference between EZ, SR and -1 heads. My take on it is that if the EZ heads will get you the number you're shooting for then that is the way to go.
I think I could have netted the same result using any of these heads...I used the 440-1's simply because I already had them, and I also wanted to leave some HP on the table for a later upgrade, plus I also thought the bigger port volume might be better for that 175 Shot of laughing gas I plan on tossing at it
