The timing marks and running engine won’t line up as you are finding. The engine must not be turned over for any length of time on the starter. The four "strokes" in the 4-cycle engine refer to the process of intake, compression, power, and exhaust. Direct the timing light on the timing marks. Once started, do not allow the engine to idle for the first 20 minutes and keep the revs to a minimum of 2500 rpm. The timing of the ignition refers to the point between the compression and the power strokes at which the spark plug fires, creating the combustion that results in your horsepower, forcing the piston down into the cylinder. A few tips on how to get your timing marks correct on a 350 chevy. This will drop the pistons down in No.1 and No.4 cylinders and ensure there is no unwanted piston to valve contact when the camshafts are rotated without the timing belt installed. By moving the firing order of the spark plug wires in the distributor and readjusting the timing by moving the distributor until the engine runs smooth will make it work. The sequence in which this happens is very finely balanced, or "tuned," to provide maximum power and economy. A few tips on how to get your timing marks correct on a 350 chevy. The light works as a strobe light and you'll see the timing marks stationary. Downside is the timing marks are now useless. Understand the ignition cycle. Read through a few of the timing threads the search returns, and you will probably find the information you need. If the installation marks have disappeared, place a new installation mark on the timing belt before removing each part. If timing specifications call for 10 degrees base timing BTDC, and the reference line is pointing to the 3rd degree mark, adjust timing. factory timing alignment marks chain sets & belt drives gm ohv v8 250 (4.1ltr) gm chevrolet v8 sb 305, 327, 350, 400 petrol engine gm v8 350 (5.7l) diesel gm v8 ohv 368, 425 oldsmobile v8 ohv 260, 307, 350, 403 renault toyota 4 cyl ohv & ohc 2tg, 3tc, 3k-c, 4k-c, 4k-e toyota 3k-4k If the timing mark is at 2 degrees or 10 degrees to the left (CCW), the marks would be at 1:26 and 1:10, respectively. This will ensure adequate lubrication of the cam and followers and reduce … the line is to the LEFT of the keyway, looking at the front of the damper or engine. EM–20 ENGINE MECHANICAL – TIMING BELT Ignition timing is when the distributor sends an electric spark into the engine to ignite the fuel. The line or notch will point to the current degree mark. 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