Headers..
May 22nd, 2013, 12:34 PM
#1
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Join Date: May 2013
Location: Calgary, AB
Posts: 16
Headers..
Good day all! just wondering what your thoughts on the "rough" increase in HP would be from switching out original exhaust with a set of Hedman's would be on this 69 350? Keeping the existing duels, so just headers. BTW love the site!
May 22nd, 2013, 01:25 PM
#3
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Join Date: Feb 2009
Location: West Hartford, CT
Posts: 1,460
This forum seems just fine. I would say anywhere from 10-25 HP depending on peripheral tuning & exhaust configuration.
Exhaust - 2 1/2" mandrel bent duals w/ xover or x-pipe should allow much better scavenging of exhaust.
Potential carb (more fuel to keep mixture ideal w/ better cylinder extraction) & timing adjustments (quicker advance curve) should help air throughput efficiency.
Regardless of the actual increase, you will feel a noticeable improvement as long as mixture doesn't get too lean & you don't pursue optimizing it.
Exhaust - 2 1/2" mandrel bent duals w/ xover or x-pipe should allow much better scavenging of exhaust.
Potential carb (more fuel to keep mixture ideal w/ better cylinder extraction) & timing adjustments (quicker advance curve) should help air throughput efficiency.
Regardless of the actual increase, you will feel a noticeable improvement as long as mixture doesn't get too lean & you don't pursue optimizing it.
Last edited by bccan; May 22nd, 2013 at 01:50 PM.
May 22nd, 2013, 01:27 PM
#4
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Join Date: May 2012
Posts: 21
I have and had them on my Cutlasses throughout the years and if you dont mind the work of putting them in go for it. Drivers side is rough. Do use a heat sheild or blanket to keep the starter cool because if I remember right its a pain to change once the headers are in. And if its old replace it when you do the headers. Personally I like stock exhaust. Less problems.
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