The firing order for a 1998 5.7-liter V8 engine, commonly found in Chevrolet and GMC trucks, is 1-8-4-3-6-5-7-2. This order is crucial for proper engine operation and performance. The cylinders are numbered from the front of the engine to the back, with the driver's side being 1-3-5-7 and the passenger's side being 2-4-6-8.
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