Editing GM firing orders

{{copyright}} ==Overview== Firing orders for GM engines. ==Chevrolet== [[Image:Chevy_firing_orders.jpg]] *When using a 4-7 swap camshaft in a Chevrolet Small or Big Block, the firing order will change to 1-8-7-3-6-5-4-2. *In the case of reverse rotation marine engines where the distributor rotation is opposite of a standard rotation engine, the reverse rotation firing order becomes '''1-2-7-5-6-3-4-8'''. Be sure on the Chevy V8 that the #5 and #7 wires aren't accidentally transposed. They are next to each other in the firing order as well as at the cylinder head, so be careful. [[File:Sbc fo.jpg]] ==Buick== ===Buick V8=== [[File:Buick v8 firing order.jpg|border]] *The 1970 Buick 350 ci engine has a firing order of 1-8-4-3-6-5-7-2 and the rotor spins counterclockwise. The number 1 distributor cap terminal is at 5 o'clock viewed from in front of the car. *1963-'66 401 and 425 ci Buick engines have a firing order 1-2-7-8-4-5-6-3 and the rotor spins clockwise. The number 1 distributor cap terminal is between 8 and 9 o'clock viewed from in front of the car. *The 1964-'66 300 and 340 ci Buick engines have a firing order of 1-8-4-3-6-5-7-2 and the rotor spins clockwise. The number distributor cap terminal is at the 4 o'clock position viewed from in front of the car. ===Buick V6=== [[File:Buick V6 firing order2.jpg]] ==Oldsmobile== [[File:Olds firing order.jpg|border|250px|]] ==Pontiac== [[File:Pontiac firing order.jpg|border|260px|]] ==Cadillac== ===331, 365, and 390 V-8 1962-back=== [[File:Cad firing order 390 62-back.jpg|frame|left|1962-back 331, 365, and 390 ci with counterclockwise distributor rotation.]] <br style="clear:both"/> ===390, and 429 ci 1963-up === *1-8-7-2-6-5-4-3 *Clockwise rotation ===368, 425, 472, and 500 ci 1968-up === *1-5-6-3-4-2-7-8 *Clockwise rotation [[File:472.png]] ===4.1L and 4.5L=== [[File:Cad 4.1-4.3 L fo.jpg|frame|left|4.1 and 4.5 L]] <br style="clear:both"/> ===Northstar=== *1-2-7-3-4-5-6-8 [[Category:Engine]] [[Category:Firing orders]] [[Category:GM]] [[Category:Ignition]]

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