Does anyone know what shapes are used when and how and why in vehicles? For example, what exactly is the difference between the C16SE/c16LZ and the c16NZ combustion chamber? Where exactly can you find the most detailed explanations? Also what are the advantages and disadvantages of various combustion chambers? What is a fire bridge…? Have 2 pictures attached. Hope you can recognize it to some extent. The head with the black soot is the one of the c16nz, the other with the cracker that shines so brightly is the r c16SE/c16LZ head.