Factory GM engines have lots of different parts that work together to produce the power your car or truck uses to move. The main part of any motor is the engine block. Its pistons pump up and down, and that pressurizes a mixture of air and fuel. The engine block contains it all with help from a cylinder head attached to the top, which seals the area and helps prevent gas loss. Cylinder heads contain two types of valves: intake valves and exhaust valves, which adjust airflow, fuel amount, and exhaust fumes inside it. Meanwhile, your camshaft helps ensure the valves open and close in sync with all the proper parts. Finally, your spark plugs ignite that fuel/air mix, and combustion occurs, releasing that motive energy. Your crankshaft converts the resulting power to rotational motion, and your driveshaft works with your transmission to transfer it to your tires. This makes them turn. Many other engine parts participate in the process. The engine oil pan or oil sump, for instance, attached to your engine's bottom, stores the motor oil used to lubricate it. Other engine parts make sure everything fits together. They include everything from gears and sprockets to rings, bearings, and even sensors. Eventually, all the parts of even a high-quality OEM engine like GM makes can wear out, leading to engine trouble. The signs include a lit Check Engine indicator, problems starting, stalls, idling or acceleration issues, and even loss of fuel efficiency. Luckily, you can order the best GM engine replacement parts for any project online, right from our auto parts counter. Go genuine for best results -- it'll save you time, money and hassle. Buy now!