Can the cylinder head from a Honda d16z6 vtec engine be adapted successfully to fit and operate properly on d15b6 block?

While the D15B6 and D16Z6 engines share many similarities, the cylinder heads are not directly interchangeable. The D16Z6 cylinder head has VTEC (Variable Valve Timing and Lift Electronic Control) technology, while the D15B6 does not. This means that the D15B6 engine block does not have the necessary oil passages and mounting points to support the VTEC system.

Additionally, the D15B6 and D16Z6 engines have different combustion chamber volumes and valve sizes. This means that using the D16Z6 cylinder head on the D15B6 block would result in a significant change in the engine's compression ratio and air/fuel mixture, which could lead to performance issues and potential engine damage.

Therefore, it is not recommended to adapt the cylinder head from a Honda D16Z6 VTEC engine to fit and operate properly on a D15B6 block.