It means that sometimes I just cannot believe that such simple modifications make such a huge kick in performance increase 
Factory Exhaust... Why no Headers?
Melting Slicks
Joined: Nov 2013
Posts: 2,264
Likes: 3
From: Orchard Park NY
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
My previous 89 Vette had the Stainless Steel exhaust manifolds too. Look closely at your 85 again. It might look like cast iron behind the heat shield but, it is stainless steel.
.
Last edited by GKK; Apr 8, 2014 at 05:07 PM.
Drifting
Joined: Aug 2010
Posts: 1,704
Likes: 8
All C4 L98 Vette's 85-91, should have the Stainless Steel exhaust manifolds. The only difference is, the later years with the Aluminum Heads had the D shaped exhaust ports.
My previous 89 Vette had the Stainless Steel exhaust manifolds too. Look closely at your 85 again. It might look like cast iron behind the heat shield but, it is stainless steel.
My previous 89 Vette had the Stainless Steel exhaust manifolds too. Look closely at your 85 again. It might look like cast iron behind the heat shield but, it is stainless steel.
they are from the factory on any early C4 ,i think even on the crossfire.My 85 has the same design,they are some sort of shorty headers,just a difference in the collector design.The four pipes are pushed into a quarter of circumference.typical headers collector
stock c4 collector design
[IMG]
[/IMG]here you can see how they'r squeezed into the collector
[IMG]
[/IMG]
Last edited by tunedport85inject; Apr 8, 2014 at 04:53 PM.
Team Owner
Joined: Aug 2004
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From: Park City Utah
Drifting
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From: Ashland PA
2021 C4 of the Year - Modified Finalist
Last edited by eutu1984; Apr 8, 2014 at 07:47 PM. Reason: add
Burning Brakes
Joined: Mar 2005
Posts: 800
Likes: 2
All C4 L98 Vette's 85-91, should have the Stainless Steel exhaust manifolds. The only difference is, the later years with the Aluminum Heads have the D shaped exhaust ports.
My previous 89 Vette had the Stainless Steel exhaust manifolds too. Look closely at your 85 again. It might look like cast iron behind the heat shield but, it is stainless steel.
.
My previous 89 Vette had the Stainless Steel exhaust manifolds too. Look closely at your 85 again. It might look like cast iron behind the heat shield but, it is stainless steel.
.
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Safety Car
Joined: Jan 2004
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From: Northern California
Burning Brakes
Joined: Sep 2005
Posts: 993
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From: Iowa
If I really cared about the HP increase on my C4 I would probably get it somewhere other than full length headers. It's probably just me but I don't care to deal with the heat and issues that I have had with the past half dozen cars that have had them. They work great for what they are for; if I am racing something it has big tube headers on it...if I'm cruising the streets it doesn't...just my .02
Le Mans Master
Joined: Dec 2006
Posts: 5,139
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From: H-Town Texas
While they may look a little nicer, I would think that you are paying the price of more heat with very little reward in terms of flow. JMHO.
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Very little, if any increase. You need LT headers. Also, make sure you have thick flanges such as Exotic Muscle or any of the good headers. With good gaskets, and locking bolts, they hold up well.
Safety Car
Joined: Nov 2008
Posts: 3,726
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From: Seattle Washington
I was surprised back in 86 when Ford installed the first Production Stainless Steel Headers on the Mustang.
I always thought the production cost and construction of production headers could be made inexpensively.
My 91 Vette has factory installed Stainless Steel Shorty exhaust manifolds!...
.
I always thought the production cost and construction of production headers could be made inexpensively.
My 91 Vette has factory installed Stainless Steel Shorty exhaust manifolds!...
.
Burning Brakes
Joined: Jun 2000
Posts: 865
Likes: 6
From: Auburn Michigan
No, my '85 had the same steel tube manifold/headers. I think it was standard issue on all L98's. Not sure about 84's or earlier.
Last edited by cohocarl; Apr 10, 2014 at 03:13 PM.
Advanced
Joined: Jan 2014
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From: Mt. Airy Md
I had an 84 and now have a 90 both had the these http://www.ebay.com/itm/CORVETTE-C4-...-/301142249246 exhaust manifolds and as far as i know only the air tube pipes are stainless the rest is rusted on both.
Racer
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Racer
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From: Tucson/Santa Paula AZ/CA
2017 C4 of Year Finalist
Burning Brakes
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Racer
Joined: Oct 2006
Posts: 438
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From: Tucson/Santa Paula AZ/CA
2017 C4 of Year Finalist
