 Not sure if this is the right way, but this is the way I did my 1st B-port. It's worked for me so far.
Free-hand.
This motor is actually the result of 2 separate porting projects. The bridges are the latest addition.
IIRC I used a 1/8" drill bit, so I was being very cautious. But Ive heard you can use a 3/16" drill bit?
There are some pictures of what others have done on google, if you type in: Rotary Bridgeport, Bridgeport 6 Port, etc. To give you some idea's.
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'89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior.
'83 RX7, The "this might take awhile" project.
'87 RX7 GXL, Rest In Pieces.
'98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair.
'94 Ford Ranger, daily.
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