For Doug:

Though I saw a pic of the port shape once upon a surf - these appear to
be square Pports:
   http://cp_www.tripod.com/rotary/images/pg03_08b.jpg

Cheers
Cary

I notice also that these are the GSL-SE style housings (O-ring in
housing, extra tension bolt) and they have positioned the port between
the bolt bosses.

Aubrey

All early 13B's. Starting with the RX4 in 1973 or 4, Truck and
13B Cosmo had the O-ring grooves in the rotor housings. You
can't always tell by looking at the bolts alone.
Much later rotor housing have the vestigial bolt bosses
on the back side of the rotor housing but not on the front side.

Paul Lamar ...No rotor no motor.

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