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Please read in full before attempting.
This procedure is for a non computerized vacuum advanced Chevy 327 and most all other non computerized Chevy small block engines.
This procedure requires a timing light, a 1/2" or 9/16" wrench, something (chalk or grease marker) to mark the harmonic balancer timing mark for reference and a rag to clean the stationary timing indicator and a basic timing light.
Check the harmonic balancer to find the timing mark, it should be a clearly cut notch which you can mark with chalk. If you can't find it, try turning the engine over and re-checking for it.
Locate and clean the stationary timing indicator with a rag. It should be located on the timing chain cover usually on the drivers side of the engine viewed from the top, very close to the water-pump.
On the indicator there should be lines and numbers corresponding with the notches. The notches are usually in increments of 2. There will also be the letters BTDC (before top dead center). Find your timing spec for your engine (check your manual) and be sure to either mark or remember where the mark is.
Locate your distributor (8 sparkplug wires coming out of it, centre rear of engine near firewall) find the vacuum hose attached and remove it from the distributor and plug the hose.
One thing I find useful is to mark the distributor for rotation so if you end up with a problem, you can rotate it back to your original starting point and start your procedure again.
At the base of the distributor on the engine block you will find a distributor retainer held down by bolt with a 1/2" or 9/16" head. Use a wrench to loosen the bolt and make sure the bolt is free and then lightly snug it back down ensuring not to rotate the distributor yet.
Hook up your timing light, red clip to positive on battery, black to negative on battery, third clip goes around the number one spark plug wire (drivers side nearest radiator), be sure to check the clip, some are marked "towards plug".
Ensure all cables are routed and secured away from all belts and fan as damage may occur when you start the engine.
Start engine and let it warm to normal operating temperature. When warm, and running, you should see the light flashing from the front of the timing light. Point the flashing light at the timing indicator and you should see the notch on the harmonic balancer that was marked earlier come into relation with the timing indicator. If you rotate the distributor, you will see the notch move in relation to the indicator. By loosening the distributor retainer a small amount, you should be able to rotate the distributor with a little bit of resistance. Please be careful when leaning over belts and fan while engine is running or personal injury may occur.
Rotate distributor until the notch lines up with the desired mark on the timing indicator and tighten the distributor hold down. Re-check timing and reconnect vacuum line at distributor, remove timing light wires and you are done.
What else can I help you with?
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