Experiments with fitting a Shvetsov M-82 radial engine to the LaGG-3 airframe finally solved the power problem and led to the Lavochkin La-5 and La-7.
Finding a solution for power issues through experiments with a Shvetsov M-82 radial engine on the LaGG-3 airframe resulted in the creation of the Lavochkin La-5 and La-7 aircraft.