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Hey guys, I have a couple of questions about block filling. How high would you fill, for a 400 block? This will be driven as well as a race engine. Will be taking this on drag week. How will this affect water and, or oil temp?

I would not fill if you are contemplating street driving. I run a 3/4 fill on my small block ( race only ) because I am pushing well over 600HP with a stock block - even though it sonic tested good. On mine, water temp is no longer an issue. With about a gallon less than stock capacity, the water goes through the rad more often. I never see over 190. Oil temp is another issue. One pass and it is in the 200 degree range. Still ok, but it gets up there pretty fast and I am sure it would continue to climb with street driving. Unless you know that the bottom end is your weak link, I would not use fill.

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