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Discussion Starter · #1 ·
just rebuilt a tall deck 427 , started up ran fine until I started to add water then had extreme amounts of white smoke from both exhaust pipes. Everything in the engine is new but obviously something is wrong . any ideas thanks. did a compression test it all checks out . only oddball is I used standard deck manifold with spacers
 

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Welcome aboard! I'd start with the intake manifold since compression is OK and it's new. Might not be sealing on the water jackets and it's possibly leaking into the intake runners.
 

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My guess is the white smoke is probley steam, I would look at the head gaskets to see where it is leaking. Did you put silicone around the water ports?
 
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