Editing Valve adjustment SBC/BBC (section)
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==Firing order== Standing at the front of the motor, looking toward the rear of the motor, #1 cylinder will be on your right, the first one, just behind the radiator. The next one to the rear will be #3, then #5, then #7 will be the last one on the driver's side, next to the firewall. Looking on the other side of the motor, the passenger side, the front cylinder will be #2, the next one to the rear will be #4, then #6, then #8 all the way to the rear against the firewall. Do whatever you have to do to get this all fixed in your mind. You can write the order on the fender wells or make a diagram on a large piece of paper and sit it against the carburetor. Knowing which cylinder is which cannot be over-stated. Also, knowing which way the crankshaft turns (CW as you face the engine from standing in front of it, looking towards the rear of the engine/vehicle) and which way the distributor rotor turns (also CW) cannot be over-stated. As you are standing at the water pump, the crankshaft turns clockwise, the same way the hands on an analog watch or clock turn. If you were to climb up on top of the motor from the front and look directly down on the distributor with the cap off, you would see the rotor turning clockwise also. See the animation [http://www.boxwrench.net/specs/chevy_sb.htm HERE]. Finding TDC on the compression stroke of cylinder #1== With a socket, extension and a long ratchet attached to the bolt head that holds the harmonic damper onto the front of the crankshaft, turn the crank clockwise while you (or a friend) holds his thumb over the #1 spark plug hole. Using the starter for this operation WILL NOT WORK. When your friend feels air pressure beginning to build under his thumb, that means that both valves are closed and the piston is coming up on the compression stroke of #1 cylinder. Watch the harmonic damper and you will see the notch that is cut into the outer ring of the damper come up to the Zero or TDC line of the timing tab. The rotor will also be coming up to terminal #1 of the distributor cap. When that notch is at TDC, STOP. You are now at approximately top dead center on #1 cylinder. It doesn't have to be EXACTLY at top dead center to adjust the valves. Make a mark on the harmonic damper ring so that you can reference this TDC position again later. Either use a yellow crayon like they use at the tire store or a piece of tape placed at that position or whatever your mind can come up with. Make the mark at the top of the harmonic balancer inertia ring. We are going to refer to this position as NORTH, because if you got down on your knees and looked at the harmonic damper from straight on, like you were looking straight through the centerline of the crank, this would be the NORTH position.
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