Tools Required

Caution: Wear safety glasses in order to avoid eye damage.

Important: When cleaning a cylinder head in a thermal type oven, do not exceed 204°C (400°F).

1. Clean the following components:

Important: Be careful not to scuff the chamber.

•	Use the J 8089 in order to remove the carbon from the combustion chambers.

•	Gasket surfaces

•	Refer to Replacing Engine Gaskets .

•	Valve stems and heads on a buffing wheel

•	Bolt hole threads

•	Remove all dirt, debris, or threadlocking material from the bolt holes.




2. Inspect the following:

2.1.	The cylinder head (1) for cracks in the exhaust ports and combustion chambers

2.2.	The cylinder head for external cracks in the water chambers

2.3.	The gasket surfaces for excessive scratches or gouging

Refer to Replacing Engine Gaskets .

2.4.	The bolt hole threads for debris or damaged threads

Refer to Thread Repair or Thread Repair Specifications .




3. Inspect the cylinder head for warpage.



4. Inspect the valve springs for squareness.



5. Use the J 9666 in order to measure the valve spring tension.

•	Replace the LS1 spring if the spring tension is less than 310 N (70 lb) at 45.75 mm (1.80 in).

•	Replace the LS6 spring if the spring tension is less than 400 N (90 lb) at 45.75 mm (1.80 in).