CA20DE/CA20DET/CA20T/CA20ET
There was never a factory-produced twin-cam CA 2.0L motor, nor a turbo version. However the blocks are similar, and it is possible to fit the DOHC CA18DE/T twincam head to the SOHC CA20 block. However the DOHC/SOHC manifolds are different and the timing pulley/belts are not compatible. Despite this, CA20DET turbos have been built. The cheaper alternative to a CA20DET is a newer SR20DET. Parts for the SR20 are less expensive and more readily available.
Tomei and JUN of Japan produced 2 litre stroker kits for the CA18. A company called Norris Designs produces a CA20 stroker kit as well as a CA20 engine.
Read more about this topic: Nissan CA Engine