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Water Jackets Underneath Plenum


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That is an important part of the manifold. It helps the flow of coolant across the head and helps prevent hot spots due to coolant lingering in areas of the head too long.

A classic example is the RD28t diesel heads in Patrol 4x4. They don't have this and subsequently get hot spots around cylinder 5 and 6 possibly leading to cracked heads and blown head gaskets.

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