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I need to know if there is a difference in torque specs. with aluminum heads on high horsepower 500 to 900 hp engines.
 

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If there is, tha head manufacturer will tell you-most engine builders have a bit of experience by the time they build 2-3hp/ci motors, and already have their methods on that one-retorquing the haeds after the heat cycle is most important there.
 
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