Read this for back ground info.
http://www.rotaryeng.net/fund-of-intake.html

These are designed to be a repairable seal for the outer
part of the water jacket. Just unscrew them and reapply
sealant if you get a leak. Welding the SS tube to the
steel rotor housing liner solved the inner seal problems.

Clean up the rotor housing with a die grinder to make it a smooth curve
and fit the plate. You can grind on the plate too if you need to.
You can also do this in a mill with the housing mounted in the mill
ready to be bored. This speeds the process as a small end mill
can be used to remove excess material.

Use the four holes as pilot holes to drill (#7) and tap the rotor housing
outer wall for four 1/4 20 or 24  socket head machine screws. After that
is done drill out the four holes in the sealing plate to 1/4 inch.

It will then be bolted to the housing and the 2 inch p-port hole bored
in the plate and in the housing. This is to insure that everything fits after
the SS tubes are welded in. This works on 13B and RX8 p-port engines.

After the SS tubes are installed and welded in this part will be
unbolted and coated with  red RTV on the bottom side to seal the
OD of the tube to the outer housing water jacket. Bolt the plate back on
and your done. You can also  pot the water jacket with Devcon Aluminum
Liquid (F-2) 10710 or JB Weld. Not necessary with this plate but it won't hurt.

They are ten dollars each. Two weigh 3/4 of a pound so send a tough envelope
with your mailing address on it along with enough postage to pay for
mailing. They are 2.5 inches wide by 2.75 inches long and 3/4 of an inch
thick. We mail only in the US. Slip a US 20 dollar bill in the envelope.
I don't want to deal with checks or credit cards. Sorry! I have better
things to do other than book keeping, shipping and handling.
Been there done that :) It also lowers the cost to you.

Send to:
830 East Santa Maria St
Suite #303 <<<<<< Very very important.
Santa Paula CA
93060.

I have a guy at the airport that will do the 2 inch hole cutting
and block fitting for you so let me know if you want
that done on your rotor housings. Cost would be roughly
$150 to $200 for each housing. He has done several for me in the past.

Paul Lamar