Okay mazda guru's...a buddy found a "good deal" on a 12A to replace another burned up motor in his Rx7. Long story short...motor runs great...needs a water pump. We can not find the correct pump. He knows this is not a legal 12A motor and will be running it with the AROSC which only cares about displacement not year/model.

This 12A is rather unique to us, but it's in and runs good:. Here are the obvious differences to a 79-85 12A

5sp trans too large in diameter, (came with a 4sp) The OAL lenth of the 4sp and 5sp is the same +/- 1". Shifter location 4-5" farther forward in 4sp.

Separate distributors for L and T

Starter centered on top of motor

Header bolt pattern closer top to bottom, same side to side.

Water pump housing and front (not rotor) housing different.

We thought this was a '73 12A from an Rx3 but those water pumps form 2 different auto part chains were not correct.

Ideas? Other than the obvious rebuild the correct 12A.