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ford block limitations


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I am a new member to this forum and hope this topic is in the right section. I am curious if anyone else here is running a fox mustang based car that still uses the stock block. I have received alot of mixed information on what kind of punishment the stock block can handle. I.e. over 400hp, over 6000 rpm = cracked block? Is there any prep work that can increase the block s inherent strength?


Opinions are appreciated.

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