Aluminum vesus cast iron block is a tough one. In one sense the cast iron is a stronger material, but in another sense the aluminum block does weigh less. This debate is reminiscent of the KA24DE found in the american 240sx and the SR20DE in the Japanese Silvia.
I can't really say which one is better and has a stronger bottom end, but the U.S. aftermarket seems to be more supportive of the sr20de, making it a more favorable engine to build with more parts available in the U.S..
It was the availability of parts in the U.S. coupled with the amount of experienced SR20 tuners that pursueded me into going with the SR20 swap instead of the CA18.
Boostboy, can you post some pictures of your CA-powered b12 for us?
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