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Headers vs. 70 Manifolds #307414
05/04/09 11:32 AM
05/04/09 11:32 AM
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Connecticut
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LL340Rag Offline OP
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LL340Rag  Offline OP
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Connecticut
I have a 340 w/360 heads final compression about 9.25. What HP gain would you guess by replacing the factory exhaust with a set of headers?

Re: Headers vs. 70 Manifolds [Re: LL340Rag] #307415
05/04/09 11:37 AM
05/04/09 11:37 AM
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ILL
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MLR426 Offline
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MLR426  Offline
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My guess would be 20 hp.

logan426

Re: Headers vs. 70 Manifolds [Re: MLR426] #307416
05/04/09 11:44 AM
05/04/09 11:44 AM
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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moper Offline
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moper  Offline
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Columbia, CT
More importantly... what camshaft?


Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
Re: Headers vs. 70 Manifolds [Re: LL340Rag] #307417
05/04/09 12:13 PM
05/04/09 12:13 PM
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Posts: 5,210
Indiana
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YO7_A66 Offline
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Indiana
Over the Winter, I swapped out my 70 HP manifolds for the TTi headers (just headers, no other exhaust changes) in my combo listed below. I am still doing some minor tuning to the carb (IFR changes and jetting) so I have not been able to drive the car as hard as I did before this swap, but so far I am very happy with the results.
The off-idle response (torque) is the best part of the swap so far. The car is very responsive in the low range now and over the weekend I found another bonus. With the HP manifolds, the most my converter would flash too at 60mph in third gear cruise was 3500rpms. Over the weekend I noticed that it is now flashing to 3700rpms at 60mph. The swap definately made a "seat of the pants" difference on the bottom end and the flash rpms show some output change too, but I do not have any track information to pass forward to back this up.


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (SL.P. 226/238@.050,270/288 dur,.538"/.528" w/Yella Terra 1.65 rockers, 9.7:1, 63cc Sidewinders (Bowl Ported),RPM intake, QF SS-750 Annular DP, MSD Street Fire Ign., & TTI's. 727/Dynamic 9.5" 3800, TF-2, & 3:91's
Re: Headers vs. 70 Manifolds [Re: YO7_A66] #307418
05/04/09 12:33 PM
05/04/09 12:33 PM
Joined: Jan 2003
Posts: 16,102
Grand Haven, MI
patrick Offline
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Grand Haven, MI
depending on cam, 10-30HP and 10-30 lb-ft torque....


1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2006 Inferno Red Dodge Caravan SXT 2011 Toxic Orange Dodge Charger R/T
Re: Headers vs. 70 Manifolds [Re: moper] #307419
05/04/09 05:36 PM
05/04/09 05:36 PM
Joined: Jan 2003
Posts: 4,507
Connecticut
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LL340Rag Offline OP
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LL340Rag  Offline OP
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Joined: Jan 2003
Posts: 4,507
Connecticut
Quote:

More importantly... what camshaft?




Comp 268XE


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