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Hello. I need to know differences between my 12a motors. One has a square chunk other has H. On the top of 12a of the front housing has a few number and on the other side has another numbers. Other engine is a normal 12a as well. Please help me With square chunk With square chunk and different housing like 13b gsl-se Square w
the one with the H's is an 81-85 engine, your picture isn't good enough, but an 81 engine has a screw in heater hose connection, the 82 has a pressed in barb and 83-85 have a T to use the beehive oil cooler
the other one is a 79 pr 1980 non California engine. 1980 California has an EGR valve on the top
the stamp is what Mazda used to do on rebuilds. around 1996-1997 they switched to a blue tag glued to the front cover.
the one with the H's is an 81-85 engine, your picture isn't good enough, but an 81 engine has a screw in heater hose connection, the 82 has a pressed in barb and 83-85 have a T to use the beehive oil cooler
the other one is a 79 pr 1980 non California engine. 1980 California has an EGR valve on the top
the stamp is what Mazda used to do on rebuilds. around 1996-1997 they switched to a blue tag glued to the front cover.
