So I have an 89 Si with a B16a in it, and I need to change the head gasket. While I'm at it, I figured I'd change the block as well (b18C1). What all is involved in doing this? Are the mounts any different, or can I literally get rid of the b16 block and drop the b18 right in? Also, will a b16 flywheel and clutch work with the b18? I have an 8 pound flywheel and stage 1 clutch lying around that I haven't bothered to put in yet, since I'm considering going to a 1.8.

 

The block is a direct swap As for the clutch and flywheel, both will work. Just remember that you will probably need to cut away the webbing under the hood in order to close the hood.

 

also i believe you will need 2 mount brackets off the b16 block. one from the back of the block and the other from the left (driver) side.

 

make sure you keep the brackets for teh rear and d/s mounts... other than that it is a direct bolt on..