4 port to 6 port swap
 

The 4 port 13b N/A in my 87 FC blew and 2 of the irons are cracked and a buddy of mine has a 6 port 13b he said he would sell to me. Basically im trying to find out 3 things:
1: What all is needed to go from a 4 port engine to a 6 port engine?

2: Are 4 ports better or are 6 ports better(stock)?

3: Will 6 port irons work to replace 4 port irons?

all FC non turbo engines are 6 port. unless the engine u have was originally turbo, but built to run n/a. then there's the differences in wiring connectors, sensors, etc between S4 and S5.

i thought the S4's had 4 ports and S5's had 6 ports?

the 6 port 13b was produced in 84-85 for the fb with the gsl-se designation. this engine carried on thru the fc yrs. the turbo 2 engines remained 4 port, as well as the twin turbo fd.