Simplify the following text for a Grade 7 native English-speaking person.
Original: Designed around the existing M102 head bolt pattern , the new twin cam , 16 valve , pentroof head , had its valves set a 45 Â included angle , rather than the 40 Â angle of the BDA .
Simplified: Designed around the existing M102 engine , its valves set a 45 Â angle , rather than the 40 Â of the BDA .