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#1 |
Registered User
Join Date: Oct 2014
Location: Spearfish South Dakota
Posts: 407
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Manifolds VS Headers round two thousand
But i want opinions in C10. My 2 cents I dont like them From taking up more room under hood heat seems like there leak prone. Having a 350 put togather
Will have qudrajet sending it california will have a cam maybe thumper 8.5comprestion basicly stock heads but will have wide open exhaust. Guy thats putting togather is the go to guy around hear. He says other than making it realy loud with what i have will not make any differance. 273 gears 465 trans for now but rarley will it be above 4500 Rpm . Ya Nay?
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83 c10 long Box Daily Driver 90 Jimmy parked 98 Road King/ 06 Road Glide In memorium 63 impala SS/ 65 Chevy Panel 65 GMC Short Box/ 68 Camero |
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#2 |
Registered User
Join Date: Jan 2009
Location: Calgary, AB
Posts: 1,181
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Re: Manifolds VS Headers round two thousand
A properly setup long tube header setup will increase the torque range of a motor.
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#3 |
Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 366
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Re: Manifolds VS Headers round two thousand
Headers is the least expensive way to make more power for your vehicle. If you buy a quality set of headers and install them and the exhaust properly they are trouble free.
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#4 |
Senior Member
![]() Join Date: Oct 2007
Location: Marietta, GA
Posts: 788
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Re: Manifolds VS Headers round two thousand
Headers suck. Took them off my mild 350 and installed rams horns manifolds with 2.5" outlets. Look better, sound better, oil change ten times easier, etc, etc.
Did I mention that headers suck? |
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#5 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,602
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Re: Manifolds VS Headers round two thousand
Headers suck eh!!
Look at these ones. Going on 14 years. |
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#6 |
Registered User
Join Date: Jan 2009
Location: Calgary, AB
Posts: 1,181
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Re: Manifolds VS Headers round two thousand
A good set of headers with good gaskets and the proper set for your vehicle will work awesome.
The loudness of the vehicle is dependent on the mufflers used and people tend to stray towards the flowmaster 40s which honestly are obnoxious. |
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#7 |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,212
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Re: Manifolds VS Headers round two thousand
Headers are like anything, you get what ya pay for.
mine where $600 3/8 flange fit my angle plug heads and don't hang below the frame rail. And zero maintenance since installed It's up too your budget and goals
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" That didnt make it any newer " " Dont antique the equipment " |
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#8 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,356
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Re: Manifolds VS Headers round two thousand
My headers suck because I can't jump the starter solenoid in an emergency and it's hard to get to the oil filter. On one of my sets I have to loosen the header to remove the oil filter. I imagine that oil is just cookin' in there right next to the header. I see Geezers headers don't have those negatives but I wonder how much of an improvement they are over stock manifolds. Those couple negatives aren't super serious problems just annoying inconveniences. I will be switching back to some kind of manifolds in the near future when my current exhaust rots off.
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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#9 | |
Registered User
Join Date: Feb 2015
Location: Santa Rosa, Ca.
Posts: 539
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Re: Manifolds VS Headers round two thousand
Quote:
My Jeep CJ7 4.0 has an AFE header on it and it's awesome. My 77 C10 454 has tri Y headers no problems there either. I agree loudness is a by-product of the mufflers used. Flowmasters are just obnoxious to me!!! ![]()
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1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. |
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#10 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Manifolds VS Headers round two thousand
I've done headers before but manifolds last longer for "all season" use,
I clean them noise bumps out first,and finish them 2.25 pipes off with a nice set of obnoxious flowmaster 40s. lol
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 Last edited by motornut; 03-30-2015 at 09:03 PM. |
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#11 |
Registered User
Join Date: Oct 2014
Location: Spearfish South Dakota
Posts: 407
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Re: Manifolds VS Headers round two thousand
why did they put that bump in there?
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83 c10 long Box Daily Driver 90 Jimmy parked 98 Road King/ 06 Road Glide In memorium 63 impala SS/ 65 Chevy Panel 65 GMC Short Box/ 68 Camero |
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#12 |
Registered User
Join Date: Feb 2015
Location: Santa Rosa, Ca.
Posts: 539
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Re: Manifolds VS Headers round two thousand
casting for AIR injection tubes.
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1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. |
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#13 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Manifolds VS Headers round two thousand
Quote:
A 350 w/stock heads & 8.5:1 compression is not the best candidate for a Thumper cam. The bigger lift/longer duration amounts on the cam will bleed off cylinder pressure making that weak 8.5 compression even worse. I would up the compression or even better go w/a very mild torque based cam profile since it will rarely see the north side of 4500rpm. I say this only because I remember one of my old rides had a similar combo (74 Z/28; stock 350, stock/low compression cast pistons, stock 76cc heads, big comp cam, headers + true 2.5" duals, 4spd, 3.08's, & 26" tall BFG's). It 'sounded' good, but it couldn't move out of it's own way nor was it efficient. My buddy also had a 74 Camaro but his combo was thought out (350, just shy of 10:1 comp, smaller chamber heads w/port work, comp cam 1 step smaller than mine, same size exhaust, 4spd, 4.11's, & 28" tall BFG's). It was night & day difference. His car sounded meaner than mine despite the smaller cam, got better mpg's than mine, & flat-out moved. I'm not saying your plans are right or wrong but I would talk w/your engine builder a little more in depth if my story/experience raises any concerns.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#14 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Manifolds VS Headers round two thousand
Yes,I've also heard it was left there "disturbing" the exhaust flow,making it quieter.
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#15 |
Registered User
Join Date: Feb 2015
Location: Santa Rosa, Ca.
Posts: 539
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Re: Manifolds VS Headers round two thousand
That maybe a small side benefit. But knowing GM that single casting could make multiple different service parts, so it was more an economic thing with them.
__________________
1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. |
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#16 | |
Registered User
Join Date: Mar 2014
Location: Ionia, MI
Posts: 199
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Re: Manifolds VS Headers round two thousand
Quote:
Gears are the least expensive way to make power. If you go from the 2.73 to 3.73 you will have a 26.8% increase in torque. I have yet to see a header give gains anywhere near 20%. Maybe you will enjoy the 2200rpm at 70mph. But, I would rather get to 70 faster and be cruising at 3k. Anyway, it all comes down to budget and skill. I prefer ram horns because they can be found cheap(have a $5 set sitting by my feet) and they give tons of space to route the exhaust. I have run expensive and cheap long tubes before. The thing about long tubes is that the flange tends to distort. Even the expensive ones can distort if you don't torque(or over torque) them properly. Manifolds have a lot more "play" in them with the weight being the trade off. I pull the engine and trans for next to no reason on everything I own. With the manifolds I need to replace the gasket each and every time. With headers(newer ones) with ball flange or screw in flange it is a lot easier to pull/install the engine without removing the exhaust for the clutch, oil pan, etc. You can also easily modify the older headers to the newer style with a welder while your kind of stuck with manifolds. Well unless you do what I am doing and adding a removable screw in flange where a long tube collector would be. If you want a easy fix to cheap headers leaking, plain them then weld up a aftermarket 3/8" flange. I have done it to 3 sets of long tubes with no issue. One was 3/16" out of true and required a considerable amount of work to get back. But, for the $40 I had into them they ran leak free until the carburetor decided to ascend towards the heavens.
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1991 Metro commuter 1991 s10 future project truck 1987 V10 backup daily/junk truck 1985 K20 Winter beater 1991 R30(squarebody) c/c flatbed towrig 1994 s10 80"wb custom build |
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#17 |
Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 366
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Re: Manifolds VS Headers round two thousand
Gears do not MAKE more power they just allow the engine to operate in a different rpm range in which it makes more power.
Headers allow the Engine to MAKE more power. You gear a vehicle to allow the engine to operate in its most efficient rpm range based upon your intended use. |
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#18 |
Registered User
Join Date: Oct 2014
Location: Spearfish South Dakota
Posts: 407
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Re: Manifolds VS Headers round two thousand
Ok agree about gears got a 90 jimmy with 410s and 36s set up works good and sucks gas on hyway.
Found a cool calculater for eng rpm speed and diff and tran ratios. http://www.csgnetwork.com/multirpmcalc.html Other than putsing around a small town 25 mph has a nice tourgy Rpm 3rd its quite and low rpm 35 and 45 are good in 3rd. I live 7 blocks from I90 In western south dakota. So jump on it 75 MPH soon to be 80 with 273s will be 2450rpm 4th with 373s you can add amost a grand to that. with my trans 3rd you can run it up to 65 easy like 3800. if i did any gear change to diff would be more like 308s. I other than snow have not been able to do Less than 75 because of traffic in the 50 miles to rapid city. since moved out Denver 5 yrs ago.
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83 c10 long Box Daily Driver 90 Jimmy parked 98 Road King/ 06 Road Glide In memorium 63 impala SS/ 65 Chevy Panel 65 GMC Short Box/ 68 Camero |
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#19 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Manifolds VS Headers round two thousand
Quote:
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#20 |
Registered User
Join Date: Oct 2014
Location: Spearfish South Dakota
Posts: 407
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Re: Manifolds VS Headers round two thousand
Its not that radical of a cam made for 8.5 to one. normal stall converter.
__________________
83 c10 long Box Daily Driver 90 Jimmy parked 98 Road King/ 06 Road Glide In memorium 63 impala SS/ 65 Chevy Panel 65 GMC Short Box/ 68 Camero |
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#21 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Manifolds VS Headers round two thousand
Cam specs or p/n?
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#22 |
Registered User
Join Date: Oct 2014
Location: Spearfish South Dakota
Posts: 407
|
Re: Manifolds VS Headers round two thousand
12-600-4 [94] grind 279T comp flat tappet hyd Thumpr then theres mother Thumpr and Big Mother Thumpr
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83 c10 long Box Daily Driver 90 Jimmy parked 98 Road King/ 06 Road Glide In memorium 63 impala SS/ 65 Chevy Panel 65 GMC Short Box/ 68 Camero |
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#23 |
Registered User
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
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Re: Manifolds VS Headers round two thousand
I have long tube headers on my 86. my pros and cons.
Pros Sounds cool Maybe more power? Cons much hotter under hood coating didn't last cooks starters and wiring PITA to remove the starter. I used Percy's aluminum gaskets and spectre header bolts. No issues with bolts loosening on me. However, I might have used the wrong gaskets, used square port gaskets and I have stock heads. that might be on me. However, I'd stick with manifolds next time around. |
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#24 |
Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 366
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Re: Manifolds VS Headers round two thousand
Use header gaskets that match the header flange hole. Retorque header bolts after they have gone through a Heat cycle and cooled to room temp.
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#25 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Manifolds VS Headers round two thousand
I like headers. One of the first things I've done on all my vehicles since 1971. I would not be running them if they sucked. The headers on my '72 K2500 have been on there since 2004, same gaskets, never had to tighten them. They are inexpensive Headman Torque Steps. The dual exhaust I had made at the same time has rusted behind one muffler, that I had to repair.
I bought a '71 Custom Camper/20 in '88 with camper. It was a very nice well optioned all original truck, so when I did dual exhaust I stayed with the rams horns. On a trip to the Grand Canyon one of the rams horns blew out through the side. I limped it down to Flagstaff to a muffler shop. None of the junkyards had rams horns and no quality headers were in town, so we went with cheap headers. This was '89 and they were still on it in '04 when I stopped driving it. I had a '72 K/20 with rams horns. One day it got real loud after going over a bridge joint on the interstate. One of the rams horns had cracked all the around where it collects allowing the exhaust pipe to drop clear off. I have had more issues with rams horns than headers. I hate dealing with those carnsounded studs and don't know a single exhaust guy who doesn't hate that,too. When a donut gasket starts to leak it's a bad day in my life. One of my most dreaded repairs to do. When a header collector gasket blows I just over tighten the bolts to shear them. It's a 15 minute repair. I don't understand where all the negative attitude for headers comes from. Maybe my experience has been unusual. we're talking 44 years and who knows how many vehicles. I don't hate manifolds and I don't care if people prefer to run them. I prefer headers
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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