I bought a 85' GS and it came with a 13b 6 port but it blown a seal so I swaped the 13B to its original 12A. the braket that goes on the motor mount I turn it around so it would fit the 12A, is that ok or I better change it?

 

u'll have to get the 12a mount. the one u have was made for the 13b to bolt into the car.

 

How much for the 13b w/ blown seal?

 

I dont know if I would sale the eingen right now. I want to ribult and install on a toyota starlet. the 13b did 10.7 no NOS on the 85 rx7 so I think installing it on the
starlet would do much better. but if anything I'll let you know!

 

How was the 13B installed? Did they use an RB front mount bar or a GSL-SE crossmember?

If it's the former, you can just grab any stock mount bar and it'll work.

If the latter, you'll need a 12A crossmember and you can keep the mount bar you already have. Or you can do what I did: long studs on the front cover and some aluminum spacers.