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any motor manual,chilton,s or haynes will have a firing order diagram . the firing order is 18436572
15426378
the firing order is 1-3-4-2
Distributor rotates clockwise.
The firing order for a 1980 250 truck motor is 1,5, 6, 3, 4, 2, 7, 8. When facing the vehicle, the number one cylinder will be the first one on your left.
165432 is firing order I believe the #1 is the lower right if you looking from front of truck
You need to look for the firing order for your specific engine. That's the order you place the plug wires in. Make sure the rotation of the distributor matches the firing order.
The firing order is 18436572.
The firing order of all 3.9 L Dodge vans a trucks is 1-6-5-4-3-2.
her is a link to a diagram, http://www.hotrodders.com/forum/attachment.php?attachmentid=17192, that should be all you need to know about that.
18436572 clockwise
1-8-4-3-6-5-7-2