GM firing orders
From Crankshaft Coalition Wiki
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==Overview== | ==Overview== | ||
Firing orders for GM engines. | Firing orders for GM engines. | ||
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==Chevrolet== | ==Chevrolet== | ||
[[Image:Chevy_firing_orders.jpg]] | [[Image:Chevy_firing_orders.jpg]] | ||
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| + | *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. | ||
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| + | *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'''. | ||
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| + | 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. | ||
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| + | [[File:Sbc fo.jpg]] | ||
==Buick== | ==Buick== | ||
| − | ===V8=== | + | ===Buick V8=== |
| − | [[File:Buick firing order.jpg|border | + | [[File:Buick v8 firing order.jpg|border]] |
| − | *The 1970 Buick 350 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 | + | *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- | + | *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- | + | *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=== | |
| − | ===V6=== | + | |
[[File:Buick V6 firing order2.jpg]] | [[File:Buick V6 firing order2.jpg]] | ||
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==Oldsmobile== | ==Oldsmobile== | ||
[[File:Olds firing order.jpg|border|250px|]] | [[File:Olds firing order.jpg|border|250px|]] | ||
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==Pontiac== | ==Pontiac== | ||
[[File:Pontiac firing order.jpg|border|260px|]] | [[File:Pontiac firing order.jpg|border|260px|]] | ||
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==Cadillac== | ==Cadillac== | ||
| − | [[File:Cad firing order.jpg]] | + | ===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 | |
| − | + | *Clockwise rotation | |
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| − | 1-8-7-2-6-5-4 | + | |
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| + | ===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 | |
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