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In the
cylinder block, oil galleries, crank case ventilation channels, oil
drain back passages, and coolant passages are cast into the
block.
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These
features would otherwise require drilling or external plumbing
(with a potential for leaks).
Lost
Foam castings have tighter dimensional tolerances compared to sand
castings, because variations caused by core shift and core
variability are eliminated and there is much less tool wear over
the production life.
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