Also does anyone have any information on modifying the rotor housings for
pports?  Such as
 > > > > > location of ports, size of port holes, any kind of drawings etc?
 > > > > > Royce

I would copy the port location off of a factory 12A periphery housing. I
would shorten the port a bit at the top (to get eairlier intake closing and
at the bottom to reduce overlap a bit). The stock Port is still working at
10,000 RPM so it is a touch big for 6,000 to 6,500 RPM. I made them for 12A
housings by doing this. The passage was a piece of exhaust pipe tubing that
extended beyond the outside of the housing about
1 1/2" and connected with the manifold with a piece of radiator hose and hose
clamps. I formed the square end over the edge of the vice with a ball peine
hammer. The space around the tube I filled with Devcon Plastic Steel. A
pattern from a 12A would work just fine. You just draw one side like the 12A
and slide the pattern over a bit to account for the wider housing, and draw
the rest of it. Start to finish in 8 hours.
The periphery port is a pussycat at low revs. Much nicer running slow than
the bridge ported engines. Look in the Racing Beat catalog. The make one with
round tubing. Try it.
Lynn E. Hanover

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