• Compare cylinder head purchased to your original cylinder head.
• Clean & inspect all head bolt holes in cylinder block.
• Clean & inspect all head bolts.
• Clean & inspect cylinder block surface.
• Install camshaft seal on OHC applications.
• Check for cooling system problems. (Such as worn belts or hoses, plugged radiator or leaking water pump.)
• Check electric cooling fan operation where applicable.
• Replace thermostat.
• Prime cooling system before starting engine. "VERY IMPORTANT"

Break-In Tips

• Check for proper oil supply to cylinder head. Run for 15 minutes at 1500 RPM or to normal operating temperature.
• Let engine cool, re-torque cylinder head and re-adjust valves.
• Re-start engine, check cooling system function and CO2 level of engine. Road test.

Common Problems Leading to Cracking

• Defective cooling system components: belt, thermostat, radiator, etc.
• Weak, low or missing antifreeze.
• Broken cylinder head gasket.
• Air pocket in cooling system.
• Incorrect torquing of the cylinder head, etc.
• Incorrect timing

When you need to replace a cracked cylinder head, make sure to correct the problem that caused the cylinder head to crack in the first place.