You can have your rotors cut at Rotorsports Racing in Kannapolis NC www.
rotorsportsracing.com.
 > I prefer to use the N304-11-300 3mm apex seal for 74-85 13b's. They are
tough and easily
 > available. You will also need to change your corner seals to N225-11-321.

 > Bruce Turrentine
 > RotaryResources@aol.com

In E production 13Bs with the 3MM 2 piece seals go over 9,000 RPM with no
problem. They make 240 HP with a big street port.
Lynn E. Hanover

 
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