65 merc cyclone - 302 exhaust? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 3 (permalink) Old 12-18-2018, 08:17 PM Thread Starter
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65 merc cyclone - 302 exhaust?

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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post #2 of 3 (permalink) Old 12-19-2018, 04:18 PM
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Re: 65 merc cyclone - 302 exhaust?

It depends on the power level your after.

"Obsolete is neat"

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post #3 of 3 (permalink) Old 12-20-2018, 06:53 PM
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Re: 65 merc cyclone - 302 exhaust?

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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