What order do push rods go on a buick century 3100?

There's no single "order" for installing pushrods on a Buick 3100 V6 engine in the sense of a specific sequence like 1-2-3-4-5-6. The pushrods are not numbered or keyed to a specific cylinder.

However, there's a crucial process you must follow:

1. Correct Identification: Ensure you have the correct length pushrods for each cylinder location. The 3100 V6 uses different length pushrods, and mixing them up will cause catastrophic engine damage. There's a difference between intake and exhaust pushrods, and often even a slight difference within those categories.

2. Proper Placement: Each pushrod goes from the lifter (located in the engine block) to the rocker arm on the cylinder head. You must install each pushrod into the corresponding lifter and rocker arm for its respective cylinder.

3. Visual Inspection: The best way to guarantee correct installation is to visually verify that each pushrod is going to the correct location. Carefully examine the position of each lifter and rocker arm to match them with the appropriate pushrod.

In short: There's no 1-2-3 order, but you absolutely *must* use the correct length pushrod for each cylinder's intake and exhaust valve. If you're unsure, a repair manual specific to your Buick Century's 3100 engine is essential. Improper installation can lead to bent pushrods, damaged lifters, and severely damaged valves.