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Four-bolt main caps are generally mandatory for engines used in moderate to serious competition. If you have a two-bolt main block, chances are very good that it will work just fine for most street performance applications up to 375/400 horsepower level.
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Four-bolt main caps are generally mandatory for engines used in moderate to serious competition. If you have a two-bolt main block, chances are very good that it will work just fine for most street performance applications up to 375/400 horsepower level.  View Related Article

 

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