Gentlemen,
I have a 1974 Chevy 250, stock head, RV cam. when I adjust the valve lash I tighten the rocker. (stamped steel) until I can no longer spin the push rod with my fingers, then I tighten the nut an additional full turn , when I start the engine it runs crappy and the vacuum needle jumps around, when I readjust the most I can tighten the nut past zero lash is 1/4 turn or it runs crappy. any thoughts?
than you.
el viejo
