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Last time I check, Dart did not make a block for any H series, only B series. I searched around a bit more and found that closed deck blocks do have a problem; overheating. Because the deck is closed and not exposed to or to as much water jackets compared an open deck block, problems arising from overheating is the main problem with closed deck applications. So, I've heard open deck arent good choices because they cant handle high boost combined with race gas that can cause slipping of coolant into the motor (or something along those lines), and closed deck blocks can overheat too fast. I've seen a great deal of built h22a1 and h22a4, so im presumming as long as you properly sleeve, build, and tune correctly, there shouldnt be any problems.
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