Hey guys,

I have a question about the SBC 400 steam holes in the heads. I was wondering if they are absoloutley needed and why. Is it because of the siameese cylinders? I'm wondering because my engine is a new rebuild from a performance shop in Indianapolis and they never said anything about this. The engine has aluminum heads from PBM and I don't know if these holes are there or not. What are the consequences of not having them? My engine runs cool never above 190 degrees (even just sitting there idling- I also have a electric fan. Of course It's only about 25 degrees here in Minnesota so I haven't had a problem with overheating. Haven't really driven the car much since the new engine. Maybe 3-5 times when the streets are clear of snow and ice.