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Best performance exhaust manifold for smallblock #577485 01/09/10 02:51 PM 01/09/10 02:51 PM
Joined: May 2005 Posts: 41 Denmark, Aeroe M Moparbil OP member
Moparbil OP member M Joined: May 2005 Posts: 41 Denmark, Aeroe	Stock 340HP manifold vs. shorty headers What is best for at street car. Can the aftermarket shorty headers match the 340 HP Going for one of these two, tried of long headers low clearance to ground.

Re: Best performance exhaust manifold for smallblock [Re: Moparbil] #577486 01/09/10 04:29 PM 01/09/10 04:29 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	the shorties would flow better but make sure they'll fit your app and or be prepared to rework one or more pri tubes. 340 HP's are 2&1/4" outlet and the drivers side one is somewhat restricted from the mandated bends & I'd assume the collector on the header is 2&1/2" or 3". Last edited by RapidRobert; 01/09/10 04:31 PM. live every 24 hour block of time like it's your last day on earth

Re: Best performance exhaust manifold for smallblock [Re: Moparbil] #577487 01/09/10 05:05 PM 01/09/10 05:05 PM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC master
JonC master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	If you have the $$, TTI's are the way to go.

Re: Best performance exhaust manifold for smallblock [Re: JonC] #577488 01/09/10 06:26 PM 01/09/10 06:26 PM
Joined: Jan 2003 Posts: 27,468 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,468 So Cal	What shorty or tri Y headers are you looking at?? I've heard the Headman shorties in a A-body don't fit well at all. I don't know if they fit B/E bodies any better. Schmacher made some big block A-body tri Y headers. Those are nice. But only for that application.

Re: Best performance exhaust manifold for smallblock [Re: Moparbil] #577489 01/09/10 07:15 PM 01/09/10 07:15 PM
Joined: Jan 2003 Posts: 5,894 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,894 Florida	Quote: Stock 340HP manifold vs. shorty headers What is best for at street car. Can the aftermarket shorty headers match the 340 HP Going for one of these two, tried of long headers low clearance to ground. Here is a Mopar Muscle Magazine test of a variety of OEM manifolds and assorted headers. Exhaust dyno tests.

Re: Best performance exhaust manifold for smallblock [Re: Locomotion] #577490 01/09/10 07:32 PM 01/09/10 07:32 PM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	I find it pretty amazing that they only found 8-10HP/10-15 TQ going from stock 340 manifolds to full buggie TTi's.

Re: Best performance exhaust manifold for smallblock [Re: ScottSmith_Harms] #577491 01/09/10 07:51 PM 01/09/10 07:51 PM
Joined: Jan 2003 Posts: 20,623 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,623 Eagle, Idaho	That is a very tame engine that isn't moving a whole lot of air. Once you get into the 1.25 - 1.5+ HP per cubic inch range cast iron manifolds will really start to kill power. I'd like to see that engine re-tested with a larger camshaft.

Re: Best performance exhaust manifold for smallblock [Re: Neil] #577492 01/09/10 08:13 PM 01/09/10 08:13 PM
Joined: Jan 2003 Posts: 27,468 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,468 So Cal	Quote: That is a very tame engine that isn't moving a whole lot of air. Once you get into the 1.25 - 1.5+ HP per cubic inch range cast iron manifolds will really start to kill power. I'd like to see that engine re-tested with a larger camshaft. That's over 425 HP. I would think a 360 cid with 9.5:1 compression, CompXE 268 cam, 1.88 heads, RPM dual plane, would be under 400 HP???

Re: Best performance exhaust manifold for smallblock [Re: Neil] #577493 01/09/10 08:15 PM 01/09/10 08:15 PM
Joined: Aug 2008 Posts: 1,568 Omaha, Nebraska Scott Carl pro stock
Scott Carl pro stock Joined: Aug 2008 Posts: 1,568 Omaha, Nebraska	I heard stock Magnum manifolds perform well. I plan on running them on my 318 build. The ones I have are # 53010188 and 53010187. I know there are a couple other part numbers depending on the application but mine came off a Dakota IIRC.

Re: Best performance exhaust manifold for smallblock [Re: Scott Carl] #577494 01/09/10 08:18 PM 01/09/10 08:18 PM
Joined: Jan 2003 Posts: 27,468 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,468 So Cal	Quote: I heard stock Magnum manifolds perform well. I plan on running them on my 318 build. The ones I have are # 53010188 and 53010187. I know there are a couple other part numbers depending on the application but mine came off a Dakota IIRC. I thought there was never a magnum left side manifold that would clear the driver side steering on an older RWD mopar.

Re: Best performance exhaust manifold for smallblock [Re: autoxcuda] #577495 01/09/10 08:23 PM 01/09/10 08:23 PM
Joined: Aug 2008 Posts: 1,568 Omaha, Nebraska Scott Carl pro stock
Scott Carl pro stock Joined: Aug 2008 Posts: 1,568 Omaha, Nebraska	Quote: Quote: I heard stock Magnum manifolds perform well. I plan on running them on my 318 build. The ones I have are # 53010188 and 53010187. I know there are a couple other part numbers depending on the application but mine came off a Dakota IIRC. I thought there was never a magnum left side manifold that would clear the driver side steering on an older RWD mopar. I haven't had them on yet but just holding them in the general area and eyballing I think they'll work in my Challenger. Hope so anyway...

Re: Best performance exhaust manifold for smallblock [Re: autoxcuda] #577496 01/09/10 08:41 PM 01/09/10 08:41 PM
Joined: Feb 2005 Posts: 4,316 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,316 Prospect, PA	Quote: That's over 425 HP. ??????

Re: Best performance exhaust manifold for smallblock [Re: BSB67] #577497 01/09/10 08:46 PM 01/09/10 08:46 PM
Joined: Jan 2003 Posts: 27,468 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,468 So Cal	Quote: Quote: That's over 425 HP. ?????? Neil wrote: Quote: Once you get into the 1.25 - 1.5+ HP per cubic inch range cast iron manifolds will really start to kill power. So.... 360 cubic inches times 1.25 HP/CID equals 450 HP ?? Or am I figuring something wrong??

Re: Best performance exhaust manifold for smallblock [Re: BSB67] #577498 01/09/10 08:47 PM 01/09/10 08:47 PM
Joined: Feb 2003 Posts: 6,849 F fullmetaljacket master
fullmetaljacket master F Joined: Feb 2003 Posts: 6,849	Man, you put that Charger on a fair diet and tool up on the converter and gear and you got a good low 11 flat piece.

Re: Best performance exhaust manifold for smallblock [Re: autoxcuda] #577499 01/09/10 08:59 PM 01/09/10 08:59 PM
Joined: Jan 2003 Posts: 20,623 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,623 Eagle, Idaho	Quote: Quote: Quote: That's over 425 HP. ?????? Neil wrote: Quote: Once you get into the 1.25 - 1.5+ HP per cubic inch range cast iron manifolds will really start to kill power. So.... 360 cubic inches times 1.25 HP/CID equals 450 HP ?? Or am I figuring something wrong?? What I meant to say is that particular test engine is very mild (camshaft is to blame) so it didn't respond very much to the headers. If you were to perform the same testing on a 1.25 and up hp per cubic inch engine the results would start to favor the headers a lot more.

Re: Best performance exhaust manifold for smallblock [Re: Moparbil] #577500 01/09/10 09:08 PM 01/09/10 09:08 PM
Joined: Jul 2005 Posts: 757 Toronto, Ont, Canada boydsdodge super stock
boydsdodge super stock Joined: Jul 2005 Posts: 757 Toronto, Ont, Canada	I love my A body TTIs. I was running 68 340 manifolds and these fit better and feel great.

Re: Best performance exhaust manifold for smallblock [Re: Neil] #577501 01/09/10 09:14 PM 01/09/10 09:14 PM
Joined: Jan 2003 Posts: 27,468 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,468 So Cal	Quote: What I meant to say is that particular test engine is very mild (camshaft is to blame) so it didn't respond very much to the headers. If you were to perform the same testing on a 1.25 and up hp per cubic inch engine the results would start to favor the headers a lot more. I understand that it's a mild engine and won't responds to headers much. But from the numbers you gave, you won't see much gain unless you have a well over 400 HP motor. Would your typical street 360 with something like a Comp XE268 cam see much gain from headers?

Re: Best performance exhaust manifold for smallblock [Re: autoxcuda] #577502 01/09/10 09:27 PM 01/09/10 09:27 PM
Joined: Jan 2003 Posts: 5,894 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,894 Florida	Yes, it should. As the dyno test shows, every step that provided a better flowing exhaust system helped. To optimize it, it would help to try different carb settings - jets, squirters, etc.

Re: Best performance exhaust manifold for smallblock [Re: Scott Carl] #577503 01/09/10 10:40 PM 01/09/10 10:40 PM
Joined: Jan 2003 Posts: 2,111 Bowie, MD R Reggie top fuel
Reggie top fuel R Joined: Jan 2003 Posts: 2,111 Bowie, MD	Quote: I heard stock Magnum manifolds perform well. I plan on running them on my 318 build. The ones I have are # 53010188 and 53010187. I know there are a couple other part numbers depending on the application but mine came off a Dakota IIRC. The ones to get are 53006617(driver's side) and 53006618(passenger's side) which came on 1992 and early 1993 Dakotas, and are larger than later manifolds. The 1992 manifolds are 2 1/8" inside diameter, and the later ones are 1 7/8" inside diameter. See the attached photo showing an early Dak manifold on top vs. a later one. 5724203-DakMagnum92-Early93Top-LaterBottom.JPG (680 downloads)

Re: Best performance exhaust manifold for smallblock [Re: Moparbil] #577504 01/09/10 10:59 PM 01/09/10 10:59 PM
Joined: Jan 2003 Posts: 5,444 Indiana Y YO7_A66 master
YO7_A66 master Y Joined: Jan 2003 Posts: 5,444 Indiana	Last Spring I swapped out my 70HP manifolds for the TTi's on my combo below (guestimate of 370hp). I noticed right off that the main gain was the extra torque off idle and the second gain that I found was that with the HP manifolds at 60mph I was getting a WOT flash to 3500rpms and with the headers I am now getting 3700rpms at the same 60mph. That is about a 6% flash gain at 60mph which on a guestimated 370hp, that 6% is 23hp. I do not have any dyno or track numbers, just seat of the pants. Note: The TTi's have excellent ground clearance. 1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)

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