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Author
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Topic: Headers versus K-manifolds
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MidLifCrisis
Gearhead Posts: 104
From: USA
Registered: Oct 2001
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posted 01-25-2002 11:48 PM
   
I had asked if anyone knew the performance differences between the K code Hi-Po cast exhaust manifolds versus steel tube headers.
...since no one responded I am going to offer the answer. I also want to get closer to a gearhead rating  .
I found a back issue of Mustang & Ford magazine- Oct '99 and it featured a 347 stroker build up. They dyno'd the engine after the build up with both headers and manifolds. The manifolds lost an average of approx 10% total HP. So instead of 367hp it delivered something like 332hp. The article did state that with exhaust pipes added to the manifolds, that Hp was estimated to increase about 10 more due to better scavenging or beneficial backpressure.
Just wanted to enlighten the masses. Thanks, Charlie
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SteveLaRiviere
Administrator Posts: 24286
From: Saco, Maine Toys: '70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
Registered: May 99
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posted 01-26-2002 10:21 PM
Good to know. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
MCA Member # 47773
My favorite tool is Occam's Razor
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kcode
Gearhead Posts: 2170
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 01-26-2002 10:50 PM
Charlie,
Also note, it was on a 347 stroker, and better than average heads. If you were to compare that on a stock 289, you would not see the same % difference. Hipo headers are better than stock, but not as good as tri-Y's, which aren't as good a long 4 tubes at high RPM. All of them have their advantages. One big avdantage of the cast Hipo's is that they will last the life of the car, where around here you either repaint or replace long tube headers every couple of years. Mike
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mellowyellow
Gearhead Posts: 4608
From: So. Fl.
Registered: Aug 2000
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posted 01-27-2002 11:13 AM
For the time being am going to use the K manifolds on my EFI deal.{I have them} They suggest shorty headers because of fitting problems with the AOD, etc. I wonder how much better the JBA shorties over the K's??
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MidLifCrisis
Gearhead Posts: 104
From: USA
Registered: Oct 2001
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posted 01-27-2002 07:40 PM
quote:
Originally posted by mellowyellow:
I wonder how much better the JBA shorties over the K's??[/B]
Mellowyellow, The article I saw only tested long tube headers and the cast-iron K's. I have read where the long tube headers increase low-end torque better than the shorties, but a lot of 5.0 motors use the shorties with much success. If I was building a streetmonster or something other than a retro car, I definately would use tubular headers with a ceramic or Jet-hot coating to make it last. I guess the long or short tube depends on the rest of the engine components and where you want your power curve. Charlie
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Moneymaker
Administrator Posts: 13182
From: Lyons, IL, USA
Registered: May 99
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posted 01-30-2002 11:36 AM
I'm sorry that I missed the question the first time around.  By the way, shorties will offer a neglegible increase over the HIPO manifolds. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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mellowyellow
Gearhead Posts: 4608
From: So. Fl.
Registered: Aug 2000
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posted 01-30-2002 12:39 PM
Kinda what I was thinkin. Not a Header scientist, but the design didn't look THAT good. They are not the equal length style-those wrap around like 4 worms in a foursome!
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kcode
Gearhead Posts: 2170
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 01-30-2002 01:17 PM
Four worms in a foresome, sounds like a man of experience. I alway had my concerns about those South Flordia people Mike-one on one in Kentucky
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69maverick
Gearhead Posts: 742
From: Thomaston,CT.
Registered: Jan 2001
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posted 02-07-2002 10:02 AM
I'm about to put my new 351w heads with 51cc cambers on with the Comp cam I got from Alex. I have a new set of 5.0 stock headers.
They will fit perfect but are they worth it or just go with a set of tri-y's I'm not looking to get every last HP out of it. just run strong! 5-10 hp in my opinion won't mean much to me just to rip around town!If I were racing I would want it all!! ------------------
Jim B. 70 Maverick Grabber clone 302,c4 auto
Weld drag lites,Holley 600,performer intake,comp cam,MSD ignition,2.5 " pipes Still needs paint!!
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kcode
Gearhead Posts: 2170
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 02-07-2002 11:20 PM
Jim,
When you say "new stock 5.0 headers" do you mean the stock kind that look like they were formed in a bench vise with a ball peen hammer with all of the sharp kinks, dents, and bends. Ford issue on a 90-93 5.0? Go with the Tri-Ys Mike
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69maverick
Gearhead Posts: 742
From: Thomaston,CT.
Registered: Jan 2001
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posted 02-08-2002 08:20 AM
Yes Mike they do look like they were formed in a bench vise with a ball peen hammer with all of the sharp kinks, dents, and bends. Ford issue on a 90-93 5.0!
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Moneymaker
Administrator Posts: 13182
From: Lyons, IL, USA
Registered: May 99
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posted 02-11-2002 11:38 PM
Well, they are better than "STOCK" 289-302 exhaust manifolds.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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69maverick
Gearhead Posts: 742
From: Thomaston,CT.
Registered: Jan 2001
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posted 02-12-2002 01:55 PM
Alex I guess my question would be this. I own the late model factory headers,Someone gave them to me. I don't care about spending the small amout it would cost to go with tri-y's But these STOCK headers would be a real easy fit so is it worth the gain to buy the Tri-y's??
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Moneymaker
Administrator Posts: 13182
From: Lyons, IL, USA
Registered: May 99
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posted 02-12-2002 03:41 PM
YES! Absolutly! The Tri_y's are worth it in terms of HP gain. The 5.0 headers are worth maybe a dime over stock and the Tri_Y's are worth a quarter for sure over stock. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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69maverick
Gearhead Posts: 742
From: Thomaston,CT.
Registered: Jan 2001
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posted 02-12-2002 07:16 PM
Once again a happy customer!! Thanks alex! Gotta go call summit! You don't sell headers do you?------------------
Jim B. 70 Maverick Grabber clone 302,c4 auto
Weld drag lites,Holley 600,performer intake,comp cam,MSD ignition,2.5 " pipes Still needs paint!!
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