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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Final valve adjustment settings are always done on fully warmed-up engines. Shop/Maintenance manuals always stress this (run for 30 minutes before setting valve lash).
Another factor that affects valve lash adjustments on old engines is that the valve-to-tappet (rocker arm) contact point can become quite warn and a groove gets warn into the contact face on the tappet. A good adjustment is impossible unless that contract surface is smooth (a jack-leg work-around was to use thin feeler gauges - ugh). This concern is described in some of the valve lash setting tech tips.
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