is theire any way to tell the 12a from the 13b? when i bought the car i didnt get a owners manual an would like to know because it would make life easier. Its a 82 and believe from what i have learned so far it is a 12a but want to know for sure

 

unless its been changed its a 12A... but it would say it on the rotor housings

 

only one sold in 82 was a 12a, so if its original, you've just had your question answered

if its a swap, well there could be lots of configurations, but most 13bs are FI (except of course pre-84 13b's). give us more info on the setup and we can help more, and btw if you look at the rotor housings, it has 12a and 13b stamped on them

 

just look on the rotor housings. it will have either 12A or 13B.

 

thx ill check tomorrow to dark right now

 

This stamp is located on the top of the aluminum rotor housings on the driver's side, on the horizontal surface about 4" above the spark plugs. Unless a previous owner swapped in a 13B yours is a 12A. The 13B wasn't available on the 1st gens until 1984, and even then only on the GSL-SE model.

 

Big blue air cleaner that says "Mazda" makes it a stock 12A,
Intake plenum (dynamic chamber) that says RE-EGI makes its a stock '84-'85 13B

 

All true, but some of the older 13B swaps had aftermarket carbs and such.

 

True...