However, the general approach is the same:
1. Find the timing tab: Look for a pointer or tab on the timing cover. This is what you'll align with your timing marks on the harmonic balancer.
2. Locate the marks on the balancer: The harmonic balancer (the pulley at the front of the crankshaft) will have markings. These are usually degree markings (0, 10, 20, etc.) and sometimes a single "0" mark indicating Top Dead Center (TDC) on the #1 cylinder.
3. Consult your shop manual: This is the most crucial step. A factory service manual specific to your 1986 Chevy Silverado 350 (including engine code) will provide the precise timing specification, including the initial timing setting and the location of the mark on the balancer for TDC. The manual will also show you how to properly set the timing. Different years and engine variations will have different specs.
4. Look for a sticker: Sometimes a sticker on the air cleaner or under the hood might show the initial timing setting. However, this is not reliable and should be confirmed with the shop manual.
Without the engine code (found on a sticker on the engine block) and a shop manual, it's impossible to give you the precise timing mark location. Attempting to set the timing without the correct information can damage your engine.
