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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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