pontiac 557 400 block
Hello, I am looking to put together a pontiac 400 engine. I have 2 blocks, and unfortunately both are the weaker 557 code smog engine blocks. Do I dare build one of these with a power goal of 400 hp in mind? Ill be sticking with the 3.75 stroke if that matters. If I decide to proceed, what mods should I make to improve its survivability? Main studs would be on the list, and I was wondering if filling the block might be beneficial? I'd love to find a better block, but the damn things are pretty rare in my area it seems.