Final answer:
Tech A states that an interference angle must be used on valves if a vehicle uses unleaded gasoline. Tech B states that an interference angle creates a poor seal after reconditioning valves. Both statements are correct.
Step-by-step explanation:
Tech A says that if a vehicle uses unleaded gasoline, an interference angle must be used on the valves. Tech B says an interference angle creates a poor seal when the engine is first started after reconditioning valves.
The statement made by Tech A is correct. When a vehicle uses unleaded gasoline, an interference angle must be used on the valves. This is because unleaded gasoline burns at a higher temperature, and the interference angle helps to dissipate the heat more effectively.
The statement made by Tech B is also correct. An interference angle can create a poor seal when the engine is first started after reconditioning valves. This is because the interference angle can cause the valves to stick or not seat properly, leading to compression loss and poor performance.
Therefore, the correct answer is Both. Both Tech A and Tech B are correct in their statements.