ok im confused with myself. I can understand how you can get 6 port 13b's but how come people claim they have 4 port 13b's? The only thing I can think of is peripheral port motors.

If you can please post up a pic of a 4 port please

 

13b 4port is avilable in early 13B's rx2 rx 3 or so. also TII 13b's i believe are 4 port. Then there are the people that use 12A 4port plates with se rotor housings. Which makes it a 4port 13B. I aint 100% on this information but i am close to 100% that is right.

 

6 port and 4 port refer to the intake ports in the block of the engines.6 port engines are used in N/A cars 1985 to 1991 and now rx8 has a 6 port as well. 4 ports were used in 87 thru 2002 turboed rx7s.

 

actually, the 85 GSL-SE is a 4-port 13B

 

much better.

 

 

oh ok thanks guys!

cheers

 

Its a 6 port! Other 13b housings can be used by milling the seal grooves into the housings on a CNC.