3.4 ltr V6 Toyota cylinder placement?

Answer 1

Not sure what you are asking so I will speculate. If I miss it you will need to reform the question.

Some vehicles have a separate cylinder that bolts to the engine. This isn't so in the Toyota's. If you have something wrong in the cylinder you need to remove the whole engine from the vehicle and get it to a machine shop. They can check it and see if it needs a simple sanding of the interior, called honing, or if it needs to be completely re bored and the pistons re-sized for the new bore.

Unless you have a huge crack, the original can most often be reused cheaper than getting a new assembly.

If you are asking about which cylinder is the number 1 cylinder and which is the number 2. Then stand in the front of the car with the hood up. looking at the motor you see 3 on the left and 3 on the right. Counting front to back to your left its 1 3 5. To your right its 2 4 and 6.