The 102 or 103mm stroked out k24's making k25~26's are pretty nice, and put down some major power.
If you don't go stroked out, I wouldn't use the k24a4 bottom. The piston have been known to not clear the extra valve lift of the 3 lobe vtec heads.
But putting a z3 or a2 head on a k24 is common practice now.
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