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Old 02-07-2005, 02:06 PM
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351 marine block

What are the differences between a 351w marine block and a 351w auto block? I know some of the marine engines run opposite to normal rotation. But when stripped down to nothing but the block what are the differences between the two?

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Old 02-07-2005, 02:45 PM
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There are no differences between the marine and landlubber 351 blocks that I have seen, besides the cost.

tom
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Old 02-07-2005, 03:50 PM
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You'll have to check the 351W block, but *some* marine blocks are cast with thicker cylinder walls and internal webs. This is to increase durability under hotter operating conditions. Marine engines have to be certified as marine also, that might be the extra cost. I always thought the certification was mainly for things like the carb though. Heavy duty truck blocks and big blocks are often used because they have thicker walls.
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