Speedmaster heads are on and running.....

U did good buddy. After all u wanted a direct comparison and that’s what u got. Better compression would sure help with a better cam. Carbs can make a huge difference also. My duster was running 10.80 in really bad air and 90 some degree temperatures. Had a 750 QF on it. Switched to a Pro Systems 1000. Ran 10.54 the next pass. More tweeting now runs 10.40s in the heat. Kim