Input (grade 13): 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.
Output (grade 7): Designed around the existing M102 engine, its valves set a 45 Â angle, rather than the 40 Â of the BDA.