I am going to allow open headers on Clintons and West Bend 580 & 700 in Historic A & B classes if you can't find a suitable muffler. I realize that mufflers for these engine are hard to find so if you can't find one for the event you can use the open header.
Macs and other engines will require mufflers (or a pipe) in ALL classes.
Since this is only for 2 classes I am hoping we won't get any complaint calls to the police from the nearby homes.
ill bet just one e65 would db 80 and a pair well over 100 .. i might have problems stock flat head with short pipe db 69 ... 270 micros at limerock have 100db rule and there always in trouble with cops .. maybe we can chip in and have local bakery have free donuts them two days ..