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Old 12-10-2002, 01:12 AM   #1
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Question difference between siamese and non siamese bore blocks

i already asked once but noone seems to know. what are the pros and cons of a siamese bore block over a non siamese bore? the block i was lookin at is the N351 motorsport block. it is a wet or dry sump, 9.5" deck height, 4 bolt main block. My plans are to punch it out to 393-410 c.i., run 8-1 compression and put up to 20 pounds of boost through it via an F-1 blower. So what would be the benefit of spending the extra money for a siamese block, is it necessary, or am i good with my original choice. any input will be appreciated, thanx




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Old 12-10-2002, 01:34 AM   #2
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A siamese bore block means that there are no coolant passages between the cylinders. These blocks tend to have thicker walls, therefore a capacity for a larger overbore. They do TEND to have more cooling issues however.
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Old 12-10-2002, 01:50 AM   #3
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is that all?

thanx man you proved me right. anyone else. so since i plan on "trying" to drive my car on the street, i should stick with my original choice right. N-351. thanx,


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Old 12-10-2002, 01:56 AM   #4
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A siamese bore block tends to be stronger than a non siamese bore block. There are NO cooling issues with a siamese bore block with a good cooling system i.e. aluminum radiator, good fan, good water pump. Mine runs 185 degrees in all conditions.
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Old 12-10-2002, 02:01 AM   #5
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John, that's why I put tend in bold, my car actually ran cooler after the R block switch. If I said there was no problem, somebody will come on here and jump my sh*t for that. If you are having issues with a production block, you will have more issues with a siamese block.
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Old 12-10-2002, 11:08 AM   #6
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Gotcha, thanks for the clarification and I know exactly what you mean and agree 100%.

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