My son is studying mechanical engineering at Purdue and is currently a Junior. I'm assembling my SBC with Roller rockers on aluminum heads. I'm not familiar with the different ration aspects are. So I asked him. He told me the 1.6 will stay open a little longer for better flow. I see the math but have never installed roller rockers on an engine, let alone aluminum heads. Stock Edelbrock Pro Flow 3, Roller cam with same duration as factory (1980 Z-28) but with 10:1 pistons. Am I missing something or am I making this way too complicated? Z is going to be a cruiser, not a missile. Any help or suggestions would be great. I need to get this thing finished!