Here's why:
* Different Bore and Stroke: The 1.6 and 1.8 CVH engines have different bore and stroke dimensions. This means the cylinder head bolt patterns and valve locations won't align with the 1.8 block.
* Valve Size and Configuration: The valve sizes and configurations can vary between the 1.6 and 1.8 engines.
* Combustion Chamber Design: The combustion chamber designs are different, which can lead to improper compression ratios and performance issues.
Attempting to force a 1.6 cylinder head onto a 1.8 block would result in a mismatch and likely cause damage to the engine.
If you need a cylinder head for your 1.8 CVH engine, you must use a cylinder head specifically designed for that engine.
