Simplify the following text for a Grade 7 native English-speaking person.
Original: The new Cosworth WAA engine also was Cosworthâ s first one-piece head , i.e. the camshaft carrier was cast integral with the head itself .
Simplified: The new Cosworth WAA engine also was Cosworthâ s first one-piece head . The camshaft carrier was cast with the head itself .