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A h22a vtec head WILL fit, however, it's not recommended. It will match perfectly, but the more you run it at high rpms (vtec) the more likely you are to blow it - the h23a1 block is not meant to be run at higher rpms.
I would highly suggest being happy with the h23a1, then if something happens to it you can swap it. It's expensive to get the swap done right.
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