Performance Head Build - Some Assembly Required
The last step (but one) is to install the valvesprings. Alvarez does have an air-powered spring compressor to make the task easier, but the home builder will probably do this manually, as seen here. Powerhouse Products makes a reasonably priced version ($129). What's left? Alvarez gives each valve a whack with a plastic hammer to make sure the locks are seated, then performs a pressure test.
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