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W9 Header tube length? #2910727 04/15/21 10:24 PM 04/15/21 10:24 PM
Joined: Apr 2016 Posts: 108 WNY Moparrob68 OP member
Moparrob68 OP member Joined: Apr 2016 Posts: 108 WNY	Finally finishing up a long drawn out 434 W9/Ritter block build and sent the Dart out to have custom headers built. Trying to decide on a primary tube length.Was thinking 32"-36" 1 7/8 to 2" step headers with 3 1/2" collector. Car specs: 72 Dart Bracket car 3200 lb foot brake 727 Auto 5000 stall 4.88 Dana 12.2x31.25 slick 434 Ritter block 13.5 comp 280 dur .730 lift roller W9's fully CNC ported TI valves Mopar "420" fully ported intake 950 ProMax carb 7500 RPM shift point??? Should we make the tubes on the longer side to make torque down low for a 2000 RPM foot brake launch?

Re: W9 Header tube length? [Re: Moparrob68] #2910741 04/15/21 11:21 PM 04/15/21 11:21 PM
Joined: Jan 2003 Posts: 30,989 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 30,989 Oregon	PipeMax is your friend. Doesn't cost that much and it provides a lot of useful information.

Re: W9 Header tube length? [Re: Moparrob68] #2910766 04/16/21 01:24 AM 04/16/21 01:24 AM
Joined: Sep 2014 Posts: 4,457 Washington M madscientist master
madscientist master M Joined: Sep 2014 Posts: 4,457 Washington	Originally Posted by Moparrob68 Finally finishing up a long drawn out 434 W9/Ritter block build and sent the Dart out to have custom headers built. Trying to decide on a primary tube length.Was thinking 32"-36" 1 7/8 to 2" step headers with 3 1/2" collector. Car specs: 72 Dart Bracket car 3200 lb foot brake 727 Auto 5000 stall 4.88 Dana 12.2x31.25 slick 434 Ritter block 13.5 comp 280 dur .730 lift roller W9's fully CNC ported TI valves Mopar "420" fully ported intake 950 ProMax carb 7500 RPM shift point??? Should we make the tubes on the longer side to make torque down low for a 2000 RPM foot brake launch? IMO, the tubes are too small and too long. You are 434 inches. I agree with Andy. Get PipeMax and run it. I’m betting you’ll find I’m pretty close. Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

Re: W9 Header tube length? [Re: Moparrob68] #2910776 04/16/21 02:22 AM 04/16/21 02:22 AM
Joined: Aug 2003 Posts: 43,097 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,097 Bend,OR USA	I'm thinking 2.0 stepped to 2 1/8 or maybe 2.0 step to 2 1/4 inch primary around 25 to 28 inch long with a 4.0 collector 12 to 18 inch long There is no bottom end below 5000 RPM, mid range yes Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: W9 Header tube length? [Re: Moparrob68] #2910834 04/16/21 09:26 AM 04/16/21 09:26 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	I used PipeMax and have for years.. I built mine as a 3 step for my W-9

Re: W9 Header tube length? [Re: MR_P_BODY] #2911055 04/16/21 07:40 PM 04/16/21 07:40 PM
Joined: Apr 2016 Posts: 108 WNY Moparrob68 OP member
Moparrob68 OP member Joined: Apr 2016 Posts: 108 WNY	What did you end up with for tube size?

Re: W9 Header tube length? [Re: Moparrob68] #2911140 04/16/21 10:55 PM 04/16/21 10:55 PM
Joined: May 2003 Posts: 13,185 aZLiViN J J_BODY I Live Here
J_BODY I Live Here J Joined: May 2003 Posts: 13,185 aZLiViN	I provided a build sheet and Greg at REF built these in a few hours. Basically 2” primaries with a 3.25 merge 4” collector. Gone 9.11 but I am the SLOKID in the W8 circles

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