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3/7/13 8:19pm - Original Message: 'OE Replacement Manifolds... or headers?'
teklein
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Woodruff, SC - USA

Vette(s):
1972 Stingray Convertible - base

Joined: 3/6/2013
Posts: 7
Hey!

I recently acquired a 72 Stingray convertible. Both exhaust manifolds are cracked pretty good.

Should I get OE replacement style manifolds or headers?

Its a 350, base, not sure whats done to it as it has a Edelbrock Performer. Could be more, could be less.

Im not too terribly concerned with keeping it original as it isnt, and was repainted black at some point in its life from either orange or red - cant tell.

If headers, what are the ones I will have the least issues with installing?

Thanks!

Tim Klein


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3/7/13 10:11pm - Reply: 'Re: OE Replacement Manifolds... or headers?'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
Headers for sure if you don't care about originality. I have a set of Hedman Hedders Street Headers with the HTC coating. Great headers made in the USA. They've been in business forever. A set of headers is probably the best bang for your buck in terms of a performance upgrade.
 


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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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3/8/13 12:19pm - Reply: 'Re: OE Replacement Manifolds... or headers?'
RuralVetter
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Newman Lake, WA - USA

Vette(s):
1980 Black/Black L82 Coupe 1974 Medium Red/Silver coupe

Joined: 2/28/2013
Posts: 20
Is there any data on how much performance increase you get with headers  I have a base 350 in the new( to me} 74 and have been thinking about storing the stock manifolds if I can find headers which would bolt in without too many changes.  The exhaust has been replaced with stainless from the manifolds back, if that makes any difference.

Thanks,
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3/8/13 12:23pm - Reply: 'Re: OE Replacement Manifolds... or headers?'
RuralVetter
Former Member
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Newman Lake, WA - USA

Vette(s):
1980 Black/Black L82 Coupe 1974 Medium Red/Silver coupe

Joined: 2/28/2013
Posts: 20
Forgot to add, The only departure from stock I see is an Edelbrock 750 cfm  carburator and a slightly taller than stock GM manifold.  The number on the manifold traces to mid 70's Camaro and Impala.

Thanks again
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3/8/13 12:54pm - Reply: 'Re: OE Replacement Manifolds... or headers?'
dcherr Gold Member
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Elkhart, IN - USA

Vette(s):
1975 Red T-Top 1972 Red Convertible

Joined: 10/7/2007
Posts: 209
It's all up to you. I sent over a year looking for the original manifolds for my 72. Removed Hooker side pipes and headers. I wented the original look manifolds. I also wented the sound of side pipes so i put on a chambered exhaust system on. It's all in what you went to do to your vett.
 
Dean


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3/8/13 2:06pm - Reply: 'Re: OE Replacement Manifolds... or headers?'
rod7515 Lifetime Member
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Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
Tim, its a shame your not closer as i could fix you up with whichever way you want to go. i have both headers and manifolds for a 72. When i finished my 72 i replaced the manifolds with hedman headers. they are very easy going on so if you go that way its no problem. mine have 800 miles on them but they are coming off to do sidepipes and headers. i think i saw you have AC so you'll need to order that bracket cause it doesnt come with it. headers have always been said to add 10-20 hp depending on type. of course they also usually require some exhaust work to fit up which is more money! but dont worry owning a vette you will get use to spending more money! lol! anyother information i can help with just yell. Rodney

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3/8/13 10:12pm - Reply: 'Re: OE Replacement Manifolds... or headers?'
daveo76
Standard Member
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 831
I offer a little different viewpoint than many on this site in that I like the original style rams horn manifolds.  I think they look cool if you clean 'em up a bit and keep 'em clean with a product like Calyx manifold dressing.  And performance wise I contend you wouldn't see much of a gain with headers if you're running a base motor, otherwise unmodified - especially in the torque department.  Don't have to deal with so many heat-related issues in the engine compartment either, like fried starters and ignition wires.  But since you don't have an existing pair you can work with that shifts the balance a bit, I know.  If you do decide to go with manifolds you could find a used pair and port them a bit with a die grinder, or possibly even find a set with 2 1/2" outlets.  Good luck, whatever you do.  

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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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3/12/13 8:48am - Reply: 'Re: OE Replacement Manifolds... or headers?'
tonytheroofer
Former Member
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Rochester, NY - USA

Vette(s):
1980 L- 82 fully restored and upgraded.

Joined: 6/12/2012
Posts: 95
If you go headers your going to replace the exhaust so with that expense in mind the manifolds seam to be a easier and less expensive choice.Additionally as it appears your not looking for more power i would go with manifolds .

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1980 , ZZ430 , 3.92 rear , 700R4 2400 stall NEW EZ EFI 
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3/12/13 8:07pm - Reply: 'Re: OE Replacement Manifolds... or headers?'
Redwingvette Lifetime Member
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Waterford, MI - USA

Vette(s):
1973 Red coupe

Joined: 9/13/2002
Posts: 1675
Corvette Fever Mag did a test years ago on a built L48 motor that showed headers to only add about three HP over stock manifolds with the motor putting up 326HP. I do not think that is much for a mostly stock daily driver. 
That motor had a lot of internal work done to it to get the 300plus HP's but was meant to look stock on the outside for the NCRS judges.
I still have the article if anyone would like to read it.


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Brian - NCM Lifetime Member
          
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
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Magnaflow Exhuast System
Dewitt radiator and dual electric fans
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3/13/13 8:05pm - Reply: 'Re: OE Replacement Manifolds... or headers?'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
There is one option for bolt on headers I noticed in "Summit", there are block hugger headers that have the donut mount on the connection, just make sure you get the ceramic coated type to keep the heat contained. I think "Patriot" was one company that made them and for a reasonable price too.

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Jimmy B.
Just can't wait to get on the road again.

 
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3/14/13 8:38am - Reply: 'Re: OE Replacement Manifolds... or headers?'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6806
If the headers were free, it would be worth it - I have 2 sets of Hedman ceramics in the shed - And I just happen to be heading in your direction next week. They need some cleaning and the D/S gas been dimpled for a rack and pinion, but they'll get you by for now.

If interested, and care to drive up to Cary, NC, they're yours!!


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