Stock 340 Rocker Arm Order

wawarnick said

I am told the notch in the rocker arm shaft goes to the front of the left head and to the rear on the right head.

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Notches are to YOUR left and down, as you are leaning over the fender.
on the passenger side, this is to the firewall.
on the drivers side, this is towards the rad.

You are correct but left and right are somewhat ambiguous; not everyone knows that the left head is the driver's side.