1-8-4-3-6-5-7-2
This means that cylinder #1 fires first, followed by cylinder #8, then #4, and so on.
It's important to note that this is a standard firing order for most small block Chevy engines, but it's always a good idea to double-check your specific vehicle's information to be sure. You can find this information in your owner's manual or by searching online for your engine's specifications.
