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Old 08-06-2008, 09:25 AM
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steam holes

the steam holes on a 400 sbc. are they really needed? this engine will be a daily driver in a truck

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Old 08-06-2008, 09:29 AM
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Hi,
IMO, yes.
Rich
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Old 08-06-2008, 10:25 AM
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Yes,Daily driver trucks came from the factory with 400 SBC engines and they had steam holes.The reason is that the cylinders are siamesed.In other words there is no gap between them like in a 350 block.
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Old 08-06-2008, 10:35 AM
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awsome thanks for the info.
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Old 08-06-2008, 02:47 PM
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Above 3,000 rpm's, there is enough turbulence in the cooling system to wash away the steam pockets. Below 3,000 (street driving), they are necessary.
www.gregsengine.com/350to400.htm
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Old 08-06-2008, 11:35 PM
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um siamesed cylinders? for real? please explain! I was planning on stroking a 400 for my next project, but never heard this. might be changing my mind...
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Old 08-06-2008, 11:47 PM
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Siamese cylinders aren't necessarily a bad thing. A lot of your big inch racing engines are like this. Just make provisions during the build for the 'steam' holes.

(has nothing to do with stoke)
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Old 08-06-2008, 11:51 PM
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Quote:
Originally Posted by 95coughnut
um siamesed cylinders? for real? please explain! I was planning on stroking a 400 for my next project, but never heard this. might be changing my mind...
Think Wang & Chang the old famous siamese twins. They were attached together.
Anyway here's a link to show the difference between the 2 types of cylinders.

http://www.chevytech.com/2c42o1.html

http://www.chevytech.com/2c42o2.html
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Old 08-06-2008, 11:55 PM
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mind changed
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