to adjust rocker on chevy's motors, the piston must be up or down?

Answer 1

There`s a sequence you do it by and piston is always up due to the fact it`s on compression stroke and both valves are closed . Below is the sequence

Answer 2

this is the easiest way to set the valves without doing them 1 cylinder at a time. first place the balencer on TDC (notch on balancer should be on zero mark)

Adjust the #1 exhaust valve

Adjust the #1 intake valve

Adjust the #3 exhaust valve

Adjust the #5 intake valve

Adjust the #7 intake valve

Adjust the #2 intake valve
Adjust the #4 exhaust valve
Adjust the #8 exhaust valve

Now rotate the engine 360 degrees. The mark on the balancer should be back at the TDC mark.

Adjust the #3 intake valve
Adjust the #5 exhaust valve
Adjust the #7 exhaust valve
Adjust the #2 exhaust valve
Adjust the #4 intake valve
Adjust the #6 exhaust valve
Adjust the #6 intake valve
Adjust the #8 intake valve

Answer 3

The rockers on most engines are adjusted with the piston up because it will be in the combustion cycle with both valves closed and both valves will have lash (clearance) if it is a solid lifter cam....if it is a hydraulic cam then you must be able to determine when a cylinder is on its firing stroke and usualy it take about a turn to a turn and a half preload on your lifter...
if you are unsure of any of these proceedures please get help
because a mistake in this area will be a BAD mistake due to the bending of valves and pushrods etc.... good luck

Answer 4

All those guys told you the sequence are right. What they haven't told you is to rotate pushrod with your fingers until you can't anymore then adjust an additional 1/4 to 1/3 turn on the nut. Anymore and your valves will be too tight and it will backfire.

Answer 5

Having the piston up on the power stroke will be the best.