Not for the faint-hearted, Willall Racing Engines of AU has developed a billet block for 4-cylinder 2.5L Subarus, using 6061 T6 aluminum. Potential HP levels are said to be in the 1000-1500 HP range. Cost from IAG for a completed engine is $15K. Must be an economy of scale market in the car world sufficient to make the initial machining investment. Doubt we'll see them at cars & coffee, eh? Google "Subaru billet block" to learn more.
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