How much power will my 347 put out? - Mustang Evolution

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Old 12-19-2011, 03:45 PM   #1
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How much power will my 347 put out?

i have a 1978 mustang mach 1. the guy that owned it before me had the engine stroked to a 347. it has a comp cam pro street, weind intake, a holley 4barrall double pumper 600cfm carb, original heads that have been ported and polished, hydrolic lifters, original exahust manifolds, and a built c-4 tranny. i have only started the motor once out of the car and it sounds way strong but i am curious how much power to expect from it any help or rough guess
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Old 12-19-2011, 03:59 PM   #2
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How much power will my 347 put out?

Maybe around 260-280ish. The stock heads really sucked back then, and they are a bottleneck in this application.
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Old 12-19-2011, 04:45 PM   #3
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How much power will my 347 put out?

well, without any specs on the cam it'll be difficult to give any kind of definitive answer. I am curious as to why the stock heads are being used as well as the exhaust manifolds. Both pieces are very restrictive; even when ported, compared to aftermarket parts. If I had to guess...290-320 MAYBE.
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Old 12-19-2011, 05:32 PM   #4
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How much power will my 347 put out?

Power depends on a lot of different factors.
I'd say at least 350 HP not knowing about your engine except what you posted.
My '347' type engine makes well over 500HP on a carb without N2O or any type supercharger......
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