I dont dont beleave it is a 3 port, I have been wrong before.
OS V Spec
SPECIFICATIONS
Stock Number: OSMG2068
Displacement: .21 cu in (3.5 cc)
Bore: 0.653 in (16.6 mm)
Stroke: 0.629 in (16.0 mm)
Practical RPM: 3,000-40,000
Output: 2.5 hp @ 33,000 rpm
if it is its a very fast 3 port that has kicked many P5's ass.
