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Headers for 68 GTX 440 #658800 04/02/10 06:06 AM 04/02/10 06:06 AM
Joined: Mar 2009 Posts: 187 Ia 4 4spdana OP member
4spdana OP member 4 Joined: Mar 2009 Posts: 187 Ia	what are headers worth over magnum manifolds ? +.030 440, 9.5 comp, 906 2.14 / 1.88 with Bowl Work, Extreme Energy 268, Performer Dual Plane, 68 Production Carter AVS 5902755-PullingEngine(9)(Small).JPG (57 downloads)

Re: Headers for 68 GTX 440 [Re: 4spdana] #658801 04/02/10 09:46 AM 04/02/10 09:46 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Depends on the rest of the exhaust. If you'r running a stock 2 1/4" exhaust maybe 10-15hp but when you go up in size and add decent mufflers maybe 25. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: Headers for 68 GTX 440 [Re: 4spdana] #658802 04/02/10 10:00 AM 04/02/10 10:00 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: what are headers worth over magnum manifolds? I cannot ans that Q directly but keep in mind that any dia reduction past the header collector flange which includes the collector reducer hurts flow and therefore your power. any backpressure past that point is detrimental (though you will always have some). I'd bite the bullet and do it right starting w some ($)tti's($) and a 3" mandrel bent system from front to rear w dynomax super turbos (walker 17769 I believe) and an X pipe in the middle and resonators(both of these are critical for noise reduction) of some sort rearward in the pipes along the springs. Have you rejetted the oe AVS. If not an eddy strip kit (there's 6 of em) but get the one w the rods/jets close to what you have now along w a pair of AFB flat metering rod caps would benefit you. The 2 step eddy rods require a 2 step type eddy jet as opposed to the oe AVS 3 step rods/3 step type jets. All oe AVS's are emission calibrated and you WILL notice a difference w rejetting and w headers you'll need to rejet anyway. live every 24 hour block of time like it's your last day on earth

Re: Headers for 68 GTX 440 [Re: 4spdana] #658803 04/02/10 10:16 AM 04/02/10 10:16 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Headers and a good free flowing exhaust with X pipe or minimum H pipe will pump it up a lot. On your combo the exhaust valves are a little too big and the cam is a tad small for the heads and an RPM performer is a better choice but yea got what yes got. what is the gears tranny and torque convereter. A 3310 750 vac would be a good crab unless it's 4 speed then a 750 DP.

Re: Headers for 68 GTX 440 [Re: 4spdana] #658804 04/02/10 10:41 AM 04/02/10 10:41 AM
Joined: Feb 2005 Posts: 4,319 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,319 Prospect, PA	In a true apples to apples comparison, maybe 20 hp. If you plan to continually add power going forward, the benefit of the headers will become even greater.

Re: Headers for 68 GTX 440 [Re: BSB67] #658805 04/02/10 01:40 PM 04/02/10 01:40 PM
Joined: Mar 2009 Posts: 187 Ia 4 4spdana OP member
4spdana OP member 4 Joined: Mar 2009 Posts: 187 Ia	sorry, the valve sizes were 2.14 / 1.81 the pipes on back would be 2-1/2 , unless 3" would be considered a gain, but maybe not with manifold exit i.d. or collector size would do at least a H-pipe 1800 stall, 3.23 on the drive train thanks for the help

Re: Headers for 68 GTX 440 [Re: 4spdana] #658806 04/02/10 03:06 PM 04/02/10 03:06 PM
Joined: May 2005 Posts: 2,295 dark side of the moon D Dougsmopars top fuel
Dougsmopars top fuel D Joined: May 2005 Posts: 2,295 dark side of the moon	with a full stock style exhaust you'd be lucky to see a 5 or 8 HP gain with headers on a dyno.

Re: Headers for 68 GTX 440 [Re: 4spdana] #658807 04/02/10 08:06 PM 04/02/10 08:06 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Quote: sorry, the valve sizes were 2.14 / 1.81 the pipes on back would be 2-1/2 , unless 3" would be considered a gain, but maybe not with manifold exit i.d. or collector size would do at least a H-pipe 1800 stall, 3.23 on the drive train thanks for the help that stall and gear are gonna kill ya.

Re: Headers for 68 GTX 440 [Re: Mr.Yuck] #658808 04/02/10 08:19 PM 04/02/10 08:19 PM
Joined: May 2005 Posts: 2,295 dark side of the moon D Dougsmopars top fuel
Dougsmopars top fuel D Joined: May 2005 Posts: 2,295 dark side of the moon	A little more converter would make a big difference

Re: Headers for 68 GTX 440 [Re: Mr.Yuck] #658809 04/02/10 08:26 PM 04/02/10 08:26 PM
Joined: Feb 2005 Posts: 4,319 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,319 Prospect, PA	Quote: Quote: sorry, the valve sizes were 2.14 / 1.81 the pipes on back would be 2-1/2 , unless 3" would be considered a gain, but maybe not with manifold exit i.d. or collector size would do at least a H-pipe 1800 stall, 3.23 on the drive train thanks for the help that stall and gear are gonna kill ya. Ya, real performance killers

Re: Headers for 68 GTX 440 [Re: BSB67] #658810 04/02/10 08:41 PM 04/02/10 08:41 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Quote: Quote: Quote: sorry, the valve sizes were 2.14 / 1.81 the pipes on back would be 2-1/2 , unless 3" would be considered a gain, but maybe not with manifold exit i.d. or collector size would do at least a H-pipe 1800 stall, 3.23 on the drive train thanks for the help that stall and gear are gonna kill ya. Ya, real performance killers yes they are he doesn't have a $$$ 500ci speciality built wedge like you.

Re: Headers for 68 GTX 440 [Re: Mr.Yuck] #658811 04/02/10 08:51 PM 04/02/10 08:51 PM
A Anonymous Unregistered
Anonymous Unregistered A	I just installed a six pack Eddy head in a 69 GTX today--TTI 1 3/4 inch fit like a DREAM! Power steering and all--The bigger tubes are really for the big HP--I love the 1 3/4 for STREET stuff

Re: Headers for 68 GTX 440 [Re: Mr.Yuck] #658812 04/02/10 10:22 PM 04/02/10 10:22 PM
Joined: Feb 2005 Posts: 4,319 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,319 Prospect, PA	Quote: Quote: Quote: Quote: sorry, the valve sizes were 2.14 / 1.81 the pipes on back would be 2-1/2 , unless 3" would be considered a gain, but maybe not with manifold exit i.d. or collector size would do at least a H-pipe 1800 stall, 3.23 on the drive train thanks for the help that stall and gear are gonna kill ya. Ya, real performance killers yes they are he doesn't have a $$$ 500ci speciality built wedge like you. Went 12s with a 440 and a .455 lift cam and compression bent exhaust. Plus, you can put more into the motor when you don't have to buy a gear, a torque converter, and tires. Last edited by BSB67; 04/03/10 07:17 AM.

Re: Headers for 68 GTX 440 [Re: BSB67] #658813 04/03/10 08:21 AM 04/03/10 08:21 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	I'd go with 3" exhaust right off (not much more money) works best and if you start to grow more hp you are already set

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