Tech A says the first external component to install when assembling an engine is the intake manifold. Tech B says the exhaust manifolds should be installed after the intake manifold. Who is correct?

both technicians are correct

Explanation:

both technicians are correct because technician A says the first external component to be installed is the intake manifold and technician B says the exhaust manifold should be installed after the intake manifold has been installed, this implies the same thing because installing the exhaust manifold after installing the intake manifold means you are installing the intake manifold first.