GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

FIRING ORDERS

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See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: Buick-built 231, 252 V6 Engine firing order: 1-6-5-4-3-2 Distributor rotation: Clockwise



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Fig. Fig. 2: Olds-built 260, 307, 350, 400, 403, 455 Pontiac-built 265, 301, 350, 400, 455 V8 Engine Firing Order: 1-8-4-3-6-5-7-2 Distributor rotation: Counter-clockwise



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Fig. Fig. 3: Buick-built 350 V8 Firing order: 1-8-4-3-6-5-7-2 Distributor rotation: Clockwise



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Fig. Fig. 4: Chevrolet-built 267, 305, 350 Firing Order: 1-8-4-3-6-5-7-2 Distributor rotation: clockwise



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Fig. Fig. 5: Chevrolet-built 262 Firing order: 1-6-5-4-3-2 Distributor rotation: clockwise

 
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