How are the cylinders numbered on the Ford 300ci/4.9L inline six?

The cylinders are numbered 1 through 6 in a straight line, with cylinder 1 at the front of the engine (a FRONT arrow in the diagram points toward cylinder 1).

What timing marks are shown on the 4.9L timing indicator?

The inset shows a degree scale with BTDC marks at 14°, 10°, 8°, 6°, 4°, and 2°, then 0° (TDC) and ATDC.

Does this diagram show how the spark plug wires connect to the distributor cap?

Yes. Each of the six distributor cap terminals is labeled with its cylinder number (6, 2, 4, 1, 5, 3 around the cap), and lines show each wire routing to its matching cylinder.

Which direction does the distributor rotor turn?

An arrow at the center of the distributor cap in the diagram indicates the rotor's rotation direction (drawn curving clockwise as viewed in the schematic).

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Ford 300ci 4.9L I6 Firing Order & Spark Plug Wire Routing Diagram

300ci 4.9L firing order diagram with distributor cap terminal layout and timing marks

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Firing-order schematic for the 300ci/4.9L engine showing cylinder numbering, distributor cap terminals, and BTDC timing scale.

AI caption January 2011 · Photo 355 of 1799

This schematic shows the spark plug wire routing and firing order layout for the Ford 300 cubic inch (4.9L) inline six-cylinder engine. The main drawing depicts the six cylinders numbered 1 through 6 from front to rear, with heavy lines representing the spark plug wires running from each cylinder down to the corresponding terminal on the distributor cap. The distributor cap is drawn from above with its six terminals labeled (6, 2, 4, 1, 5, 3 around the cap) and an arrow at the center indicating rotor rotation direction. An inset at the upper left shows the crankshaft timing indicator, with a degree scale reading from 14° BTDC through 10°, 8°, 6°, 4°, 2°, down to 0° and ATDC, along with a FRONT arrow to orient the viewer. A reader can use this diagram to correctly route spark plug wires from the distributor cap to each cylinder on a 4.9L/300ci straight-six, verify distributor cap terminal-to-cylinder assignments, and identify the base timing marks on the crankshaft pulley/timing indicator. The image carries a 'Steve83' watermark and gives no explicit year or model applicability beyond the engine designation.

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Frequently asked questions

How are the cylinders numbered on the Ford 300ci/4.9L inline six?: The cylinders are numbered 1 through 6 in a straight line, with cylinder 1 at the front of the engine (a FRONT arrow in the diagram points toward cylinder 1).
What timing marks are shown on the 4.9L timing indicator?: The inset shows a degree scale with BTDC marks at 14°, 10°, 8°, 6°, 4°, and 2°, then 0° (TDC) and ATDC.
Does this diagram show how the spark plug wires connect to the distributor cap?: Yes. Each of the six distributor cap terminals is labeled with its cylinder number (6, 2, 4, 1, 5, 3 around the cap), and lines show each wire routing to its matching cylinder.
Which direction does the distributor rotor turn?: An arrow at the center of the distributor cap in the diagram indicates the rotor's rotation direction (drawn curving clockwise as viewed in the schematic).