Valve Spring
When valves have been removed for inspection, reconditioning or replacement, valve springs should be checked against specifications for free-length, spring force and spring installed height. Refer to TECHNICAL SPECIFICATIONS .
Spring force can be measured with a test fixture (2). Follow the tool manufactures instructions. Replace any springs that do not meet specifications.
Installed height of the valve spring must be checked with the valve assembled into the cylinder head.
If the valves or valve seats have been refinished and the installed valve spring height (4) is greater than 41.0 mm (1.61 in.), install a second spring seat (8) in the head counter bore under the original valve spring seat to bring the spring height within specification. Make sure the measurement is taken from the top of spring seat (6) to the bottom surface of spring retainer (1).