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Does anyone know how the factory ford 289 HiPo exhaust manifolds flow compared to tri-y headers? They would be going on a blueprint engines 306 engine to replace the 65/66/67 log style manifolds. I'm looking for some extra flow out the exhaust. The car is a 65 mercury cyclone with toploader 4 speed.



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From what Iv'e read you should get about 10 to 20 hp by going with the headers. If you have a highly modified engine the numbers should be higher.Roger
 
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