What year are these housings? I know they are 70's 13BPic #1





Pic #2



[IMG]resized

I could be wrong but judging by the mazda emlem it's the newer style, i think those are 84-85 gls-se housings, but again i could be wrong just a guess...

Without seeing the exhaust ports, it's still a little hard to determine. However, I'd say it's a '76-'78. Please show us the exhaust ports.



Do you have info on the side plates? Is there an R5 or 3B cast into the front and rear plates?



by the way, GSL-SE housings look quite different. https://www.nopistons.com/forums/pub...DIR#>/wink.png

yeah small font mazda, with those ribs on the top of the housing says 76-78 to me too



the one on the left is a gsl-se

https://www.nopistons.com/gallery/al...l_DSC00787.JPG

Heh and the one on the right is a '71-'73 12A. https://www.nopistons.com/forums/pub...IR#>/smile.png



Edit: wait a minute, there are no little holes to hold the small sheet metal thing indicating whether it's 1 or 2 (front or rear). Hmm, both of mine have the holes. One is missing its little indicator thing though.

Here are various 13B rotor housings pics. Scroll down a bit. https://www.nopistons.com/forums/ind...howtopic=31985

LOL!

Its not a housing indicator, its what you use to hoist your engine out with.

https://www.nopistons.com/forums/pub...1047683785.gif