the aluminum caps solve a couple of problems. 1 they add strength to the caps as the aluminum is stronger than the cast iron factory caps. 2. the caps help decrease cap walk, for further stregnth add the girdle to hold the caps down even more. our caps are made taller so the girdle has direct contact with them. the main problem on the big block is the main webbing breaks when theres alot of power.
So the aluminum helps absorb some shock and keeps it out of the webbing? A billet cap could accomplish the “stronger, less cap walk” goal? I don’t even know if billet steel caps exist.
