|
Whats the best flowing 360 exhaust manifold?
#130438
09/30/08 09:50 PM
09/30/08 09:50 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
I have a small block 360 in my pure stock race car. A pure stock is a bone stock car that races on a flat third mile track. I was wondering what exhaust manifolds that will fit on a 360 will flow the best? Any answer right or wrong will be greatly appreciated. 
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
#130439
09/30/08 09:55 PM
09/30/08 09:55 PM
|
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
68-70 340 HP ex manifolds $300-$500 a set
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: RapidRobert]
#130440
09/30/08 10:09 PM
09/30/08 10:09 PM
|
Joined: Feb 2005
Posts: 682
Land of Lost
flatlinedude
No pulse
|
No pulse
Joined: Feb 2005
Posts: 682
Land of Lost
|
Magnum truck manifolds. People are giving them away.
Carol: "Wow! He's really fast, isn't he?!"
John: "Yeah... but he's stupid."
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: flatlinedude]
#130441
09/30/08 10:18 PM
09/30/08 10:18 PM
|
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
the 92/3 magnum truck ex manifolds have a much larger outlet than the later ones. iirc 1&7/8 on the later ones & over 2" on the earlier ones.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: Clair_Davis]
#130443
09/30/08 10:31 PM
09/30/08 10:31 PM
|
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
I believe the 340 hp PASSENGER manifold & an early magnum truck DRIVERS manifold would be the best combination. just looking at the pass unit with it's flowing curves & 2&1/4" outlet I cant see any other manifold being better than that especially since I think the early magnum truck outlets are 2&1/8" The price differential is night & day, I obtained a set of the early good magnum truck ones for $50.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: Andrewh]
#130445
10/01/08 09:47 AM
10/01/08 09:47 AM
|
Joined: Jan 2003
Posts: 4,820
near Alexandria, VA
Gas_Bandit
master
|
master
Joined: Jan 2003
Posts: 4,820
near Alexandria, VA
|
What body style? A driver's side truck magnum manifold is not going to fit a lot of cars w/ the steering column in the way. So then you end up with 2 manifolds w/ different sized runners and outlets......
2003 Mercury Marauder, 34k miles, 3.73s and custom flash tuned
1981 Camaro, 350 w/ Holley Stealth Ram MPEFI, Sportsman heads, roller cam, self-burned chips, wideband O2
1983 Firebird TA
1993 Saturn SL2 83k
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: ScottSmith_Harms]
#130448
10/01/08 02:09 PM
10/01/08 02:09 PM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
Quote:
I think it's even more interesting that the best headers tested (TTi's) only offered a small gain over the stock 340 manifolds.
10hp & 15 peak lb-ft is a pretty nice improvement...
keep in mind the cam in this thing is as meek as a stock 360 cam (actually slightly smaller in lift and maybe duration as a stock 360 magnum cam). pump up the cam even to say, comp XE262 type specs, and the HP and tq differential will change dramatically.
realistically, this engine should have been retested with all these exhaust options, but with something like a comp XE265HR in it as well...
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: patrick]
#130449
10/01/08 02:25 PM
10/01/08 02:25 PM
|
Joined: Feb 2003
Posts: 4,204
Fort Worth, TX
Clair_Davis
master
|
master
Joined: Feb 2003
Posts: 4,204
Fort Worth, TX
|
 The higher the state of tune, the more critical the exhaust gets. 15-20hp on a slug engine is nothing to sneeze at, and is the reason I decided to run TTI's on my Valiant's mild 340. With the headers, it makes an honest 300hp (260 to the rear wheels), and I wanted to sneak every last bit out of that engine. I think it's time we all started emailing MM and twist their arm in to doing a follow-up article on a hotter engine (say, a 380hp crate), AND a big block manifold/header article, too. Clair
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: Clair_Davis]
#130450
10/01/08 02:47 PM
10/01/08 02:47 PM
|
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms
Mr Wizzard
|
Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
|
Well (IMO) when talking about changing only one componant (exhaust) I don't see 10-15hp as a big deal, especially on a street car. Changing cams, intakes, etc. changes everything and tosses any real direct comparison out the window due to too many variables. Of course a header will be the best ultimate performance choice, and for those seeking every bit of performance they are the easy choice. Personally, but I don't like running them on the street due to heat, noise, under hood clearance, cost, etc. etc. I'll give up the 10-15hp (and those are maximimums, not accross the RPM board gains) for the lack of such potential issues. 
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: ScottSmith_Harms]
#130451
10/01/08 05:15 PM
10/01/08 05:15 PM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
Quote:
Well (IMO) when talking about changing only one componant (exhaust) I don't see 10-15hp as a big deal, especially on a street car. Changing cams, intakes, etc. changes everything and tosses any real direct comparison out the window due to too many variables.
Of course a header will be the best ultimate performance choice, and for those seeking every bit of performance they are the easy choice. Personally, but I don't like running them on the street due to heat, noise, under hood clearance, cost, etc. etc. I'll give up the 10-15hp (and those are maximimums, not accross the RPM board gains) for the lack of such potential issues.
again, this was on a motor with a cam about as wild as a stock 318. I'd like to see the test run again with the same manifolds & headers, but the only change, swapping the 300 hp crate motor cam with something like a comp XR265HR which is IIRC 218/224 at .050 and ~.506" lift
I bet peak you'd see more like a 30-40 lb-ft spread and 20-40 hp spread over the manifolds, with the torque up much higher at all RPM ranges.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: RapidRobert]
#130452
10/01/08 05:59 PM
10/01/08 05:59 PM
|
Joined: Jan 2003
Posts: 2,111
Bowie, MD
Reggie
top fuel
|
top fuel
Joined: Jan 2003
Posts: 2,111
Bowie, MD
|
Quote:
I believe the 340 hp PASSENGER manifold & an early magnum truck DRIVERS manifold would be the best combination. just looking at the pass unit with it's flowing curves & 2&1/4" outlet I cant see any other manifold being better than that especially since I think the early magnum truck outlets are 2&1/8" The price differential is night & day, I obtained a set of the early good magnum truck ones for $50.
That's what I read in a Hot Rod article based on tests done by Mopar. I'll have to look for it, but they said that a combination of the two tyoes was the best. As for the "good" Magnum manifolds, the info below originally appeared in the June 1999 Mopar Muscle Pg 77 "Dakota Secrets"
1992 and early 1993 factory Magnum cast iron exhaust manifolds are larger than later manifolds. The 1992 manifolds are 2 1/8" inside diameter, and the newer models are 1 7/8" inside diameter. The casting numbers for the 1992/early 1993 exhaust manifolds are:
53006617(driver's side)
53006618(passenger's side).
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
[Re: ScottSmith_Harms]
#130454
10/01/08 09:01 PM
10/01/08 09:01 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
Quote:
I think it's even more interesting that the best headers tested (TTi's) only offered a small gain over the stock 340 manifolds.
FWIW, a couple of decades ago I put a set of cheapy headers on a 73 Duster 340 that was otherwise stock except for a spread-bore Holley, and picked up 7 tenths in the quarter compared to the factory exhaust manifolds.
Way more than a "small gain" . . .
|
|
|
Re: Whats the best flowing 360 exhaust manifold?
#130455
10/01/08 09:28 PM
10/01/08 09:28 PM
|
Joined: Feb 2003
Posts: 4,204
Fort Worth, TX
Clair_Davis
master
|
master
Joined: Feb 2003
Posts: 4,204
Fort Worth, TX
|
What I'd like to see in another article (and what I don't remember about the last one) is whether or not the testers went through the effort to actually TUNE the engine around the new VE created by the more efficient exhaust system. IIRC, they just bolted the stuff on and made another pull to crank out some numbers. If you're not tuning the engine for the new VE, you're leaving power on the table. If the carb was right for the log manifolds, it was almost certainly lean on the headers. Fatten that up to where it needed to be, and the gains may well have been larger, even on the limp engine.
As for the OP's question, I think I remember Ehrenberg recomending the 340 PS and Maggie DS manifolds, if they'll fit the chassis in question. The 340 PS manifold is the most rare, as that long casting seems to be pretty intolerant of puddles when it's hot, and can crack.
Clair
|
|
|
|
|
