Ok so I've been searching and searching and I've found that people have thought of swapping dohc heads onto b20a3's. Has anyone successfully swapped a b21 head onto a b20a4? I believe they are similar. The b20a4 is carb sohc. I have the chance to get a full swap for cheap. It has a manual tranny so I'd be swapping to manual as well. I have a bunch of b21 parts laying around. It would be going into either a 90 or 91 si. If anyone has completed this swap what kind of power are you putting out? Is there a build thread that I'm just not seeing? I searched for over an hour.