At the link I gave above are mechanical valve lash settings (hot) from various Shop Manuals and Owners Manuals (they do not always agree, even in the same year):
216 cubic inch
Intake: .006 to 008; .010 for heavy duty operation
Exhaust: .013 to .015; .010 for heavy duty operation
235 cubic inch (high pressure)
Intake: .006
Exhaust: .016 or .018
261 cubic inch
Intake: .006
Exhaust: .018 (up to 1 ton trucks); .020 for 1 ton and larger trucks
