what is periphial port (sp?) and how does the size of the apex seal affect the motor, such as a 2mm versus a 3 mm? how much does porting a motor cost if u send your housings off to somewhere to do it, and dont pay a core charge?

 

www.rotaryheads.com

peripheral port is more or less a big hole in the rotor housing.. the air travels through that, instead of the side housings.

apex seals... 2mm seal better, 3mm are a little bit stronger, but will still break under hard detonation.

cost depends on what you want.