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You possibley have a blown head gasket on the side that is blowing water and steam. 390 s are good solid blocks pull the head on that side and check carefuly to see if you can spot the bypassed gasket. If not a gasket a good idea to have the heads checked for cracks then the engine. Small steps.

could be a blown head gasket on that side, or a bad intake gasket.

The side you see white smoke from has a head gasket or cracked head problem.

If sparkplug has water or rust on it you have located the cyl of question. Is it the Intake manifold or head gasket. Water runing into intake valve would be noticeable when you pull the intake manifold. You might hear knock when motor is hot, that would indicate steam knock from blown head gasket. Piston in question would be steam clean from antifreeze hard blast on ignition................. ........ do a compression test, a week cylinder could indicate not only a blown head gasket but also tell you what cylinder.

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โˆ™ 2015-07-17 17:29:31
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Q: Why would a Ford 390 blow white steam and water from one side of the dual exhaust?
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