Use this interactive tool to determine your engine cylinder numbering. It’s important to remember that the numbering conventions for engine cylinders differs by manufacturer. Pontiac (most 1955-81 V8 engines): Counter-clockwise 1-8-4-3-6-5-7-2 ( Note: 307 Pontiac V8 engine rotates clockwise).I can think of 4 other series of Continental L-head (flathead) engines with different letters the B, N, M & Y models plus others in earlier time frames. The F series was also made in several different 6 cylinder sizes. Oldsmobile (1967 and up): Counter-clockwise 1-8-4-3-6-5-7-2 Later the 162 became the 163, same bore and stroke diferent cranks blocks and heads.Big Chrysler and Hemi: Counter-clockwise 1-8-4-3-6-5-7-2.We’ve put together this V8 engine firing order and rotation (where applicable) cheat sheet for just such an occasion: For example, let’s say you’ve just installed a new cap and rotor kit on your carbureted V8, changed the spark plugs, and are ready to install a set of new wires. Sometimes it’s helpful to have a cheat sheet in hand to help you navigate projects–big or small. Has a simple distributor cap and rotor change quickly turned ugly? Has your once well-mannered carburetor suddenly become a smoke-puffing, gas spitting-monster? Do small, simple projects become extremely large and a little out of your league when it comes to your ride?
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