Can you use a 4g69 head on a 4g64 block?

Yes, you can use a 4G69 head on a 4G64 block, as both engines belong to the Mitsubishi 4G family and share similar architecture. However, it's important to consider potential differences in compression ratiOS and intake/exhaust flow characteristics. Proper modifications, such as adjusting the timing and ensuring compatibility of components, may be necessary for optimal performance. Always consult a professional or detailed engine manuals for specific compatibility and installation guidance.