'91 ATX B6 SOHC build questions

[invader_star]

Hey Festiva community,

I am working on a white ‘91 Festiva automatic B6 SOHC build, and wanted to ask for your advice on a few things. I have a complete running ‘87 Mazda 323 for my B6 SOHC donor, as well as a crashed automatic ‘91 Festiva for the automatic transmission donor. Having both vehicles to pull from makes me confident that I should have everything I need. Hopefully! The build car is currently a manual and I will swap it over to automatic. My questions are..

• Is there a difference between the MTX B3 ECU and the ATX B3 ECU?
• When installing the B6 SOHC, do I use the B6 ECU from the Mazda?
• Should I use the B3 intake and dizzy or should I use the B6 intake and dizzy? I assume this would matter if swapping ECU’s?
• I recall reading there’s a difference between the automatic and manual engine crossmembers, is this true?
• Is there a difference between MTX and ATX half-shafts? The rotors? The brakes?
• How does the radiator cooling loop work for the ATX? Since my donor had been crashed the radiator was shot.

I’m sure some other things will come to mind as I move through the vehicles, but these are what I was getting stuck on so far. I searched through the forum for a good while and did find some useful bits but many convert over to automatic from manual, haha.

Thanks guys!

[WmWatt]

You might get more response if you also post in the engine swap forum further down the home page. Good luck.

[invader_star]

You might get more response if you also post in the engine swap forum further down the home page. Good luck.

I was just thinking I should move this post haha. Thanks!