1/2 Filled block & Block machining

[dsmDolney]

Ive been reading on this ever since this thread came up and am kindof interested in it since i plan on building a 800 plus hp motor this winter/spring. But im still trying to fully understand what filling a block or 1/2 filling is and or what it does. I cant find a legit answer really. Basically what i understand is ur filling ur blocks water jackets and water pump wholes if i am correct ?? And filling ur block makes the block stronger if thats right ?? Someone correct me if i am wrong. Just want to figure this out ha ha