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Message: [QUOTE="sleeps, post: 865250, member: 6030"] I wish i could but I don't have the knowledge to explain that phenomenon. Just like short headers build more torque than horsepower and long tubes build more horsepower than torque. And an h-pipe exhaust system will build more torque than horsepower as compared to an x pipe system that builds more horsepower than torque. I just know it from experience on street cars that we've built for people in gassers. Most just end up going with an aluminum head i n the end anyways for all the pluses and are careful with watching heat and know the possibility of warpage if you overheat. That's why when most people come to me wanting to build a street car that haven't had anything more than stock or bolt ons, I suggest a cast iron head until they get used to watching gauges and being cautious and are ready to step up to an aluminum head. (Usually with better design and choices from a cast head) Aluminum is SO much easier to port too. Biggest thing though in my opinion...aluminum heads can be welded up and repaired. [/QUOTE]

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