Will a Toyota 22R motor for 85 pickup fit into 81 pickup?

Yes, a Toyota 22R motor from an 85 pickup will fit into an 81 pickup. The 22R motor was introduced in 1981, and it was used in Toyota pickups until 1995. The 81 and 85 pickups are both first-generation Toyota pickups, so the motor should bolt right in. However, there may be some minor differences between the two motors, such as the location of the oil filter or the fuel injection system. You may need to do some research or consult with a mechanic to make sure that the 22R motor from the 85 pickup will work properly in your 81 pickup.