440 source???

true hornet, I push over 650 streetable hp out of my .575 main saddle webbing 440 using main studs, aluminum caps,and a girdle. eagle rods,stage 6 heads, your either gonna destroy the block over 650 hp without above mentioned items, hardblock for sure for a fulltime race car otherwise them long water jacket tubes next to the bores will wrinkle the cylinder walls like a crushed pepsi can. ya can get 650 hp out of the 906 heads also but I admit I have overported a few times and watered the track down lol