I need instructions of setting valve lash on 1965 273 2bbl
setting cold? Try "
Iron block with Iron Heads: ADD .002” to Lash Settings"
when it heats up, the lash tightens up to the hot lash recommended by Mopar. Of course, your feelers will check this after a warmup but it should get you in the ballpark. Always better to err on the side of more lash than less.