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Im thinking of upgrading my motor later in. How much power would you consider safe with a sbc 400? Im thinking about possible adding some boost to it.
 

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The block on a 650-700 Hp N/A 400 motor changing to a Dart will make 30 HP

Boosting it, save your money get a block
 

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Mine is still holding in there (days are numbered I know),it makes 610 hp, and i've been spraying it with around 275ish...stock block (2 bolt w studs), and stock crank....yea I've got my fingers crossed...lol
 
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