The correct firing order is 18436572. If you need the correct cylinder locations they are as follows: Drivers side from the front 1 3 5 7; passenger side 2 4 6 8. Should be located on top of the intake manifold.
18436572
18436572
18436572
1-8-4-3-6-5--7-2 clockwise on cap.
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The firing order for a 305 Chevrolet engine is: 1-8-4-3-6-5-7-2
The firing order for a Chevrolet 305 is: 1-8-4-3-6-5-7-2
18436572
18436572 you already knew
If you have a 305 or 350, it is 1,8,4,3,6,5,7,2.
1,3,5,7,2,4,6,8,
The firing order for a 1994 Chevy 1500 Silverado 305 from the distributor cap to the spark plug is 1-8-4-3-6-5-7-2. To locate the number one plug, look for where the wires plug into the small square on the driver's side, two pegs clockwise from that square is the #1 spark plug.