Your referring to the air tubes that go into the exhaust manifold.
1985 Corvette
Thread Starter
6th Gear
Joined: Jul 2013
Posts: 6
Likes: 0
1985 Corvette
Good Afternoon :
I just recently purchased a 1985 Corvette C4 from a very sick friend of mine. It is a beautiful car but as the hot rodder that I am, I want to increase its horsepower. Can anyone help me without taking the engine out and boring and stoking it. Also I am looking at putting headers on it as well but I noticed that the current exhaust has a tube that runs, both sides, from the exhaust to what looks like the EGR valve. Do I need to drill and tap the same configuration on the new headers?
Thank You
I just recently purchased a 1985 Corvette C4 from a very sick friend of mine. It is a beautiful car but as the hot rodder that I am, I want to increase its horsepower. Can anyone help me without taking the engine out and boring and stoking it. Also I am looking at putting headers on it as well but I noticed that the current exhaust has a tube that runs, both sides, from the exhaust to what looks like the EGR valve. Do I need to drill and tap the same configuration on the new headers?
Thank You
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
The EGR sits atop the manifold base under the plenum is gold in color and about 3 1/2" in diameter. It helps you get better mileage, and only operates in high vacuum part throttle situations.
What you describe is AIR (air injection reactor). It pumps air (78% nitrogen, 21% oxygen, and 1% inert gases) into the exhaust to burn any unburnt gases. Depend on your states laws, you may, or may not remove this system.
What you describe is AIR (air injection reactor). It pumps air (78% nitrogen, 21% oxygen, and 1% inert gases) into the exhaust to burn any unburnt gases. Depend on your states laws, you may, or may not remove this system.
Le Mans Master
Joined: May 2006
Posts: 7,708
Likes: 266
From: indy indiana
headers and true dual exhaust is a good start. Next is the top end..MAF, runners and manifold. Lots of guys are dumping the 16 inch wheels in favor of the 17 inch ( 9.5 wide)wheels. Should put you in the 13s in the 1/4
Team Owner
Joined: Jul 2004
Posts: 28,430
Likes: 3,279
From: Hartford WI
Why mess with the MAF? I wouldn't fool around with the MAF if it were my car. IIRC, it can support much more than what the 350 will produce for the most part.
Melting Slicks
Joined: Apr 2011
Posts: 3,493
Likes: 475
From: New Jersey
The EGR sits atop the manifold base under the plenum is gold in color and about 3 1/2" in diameter. It helps you get better mileage, and only operates in high vacuum part throttle situations.
What you describe is AIR (air injection reactor). It pumps air (78% nitrogen, 21% oxygen, and 1% inert gases) into the exhaust to burn any unburnt gases. Depend on your states laws, you may, or may not remove this system.
What you describe is AIR (air injection reactor). It pumps air (78% nitrogen, 21% oxygen, and 1% inert gases) into the exhaust to burn any unburnt gases. Depend on your states laws, you may, or may not remove this system.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Burning Brakes
Joined: Oct 2001
Posts: 911
Likes: 5
From: TN
How much horsepower is he going to obtain with headers? A 1985 Corvette was the first American car to post a top speed of 150 MPH. The 1985 Corvette does not put out much HP above above 4,500 RPM. At what RPM do headers help?
Thread Starter
6th Gear
Joined: Jul 2013
Posts: 6
Likes: 0
The EGR sits atop the manifold base under the plenum is gold in color and about 3 1/2" in diameter. It helps you get better mileage, and only operates in high vacuum part throttle situations.
What you describe is AIR (air injection reactor). It pumps air (78% nitrogen, 21% oxygen, and 1% inert gases) into the exhaust to burn any unburnt gases. Depend on your states laws, you may, or may not remove this system.
What you describe is AIR (air injection reactor). It pumps air (78% nitrogen, 21% oxygen, and 1% inert gases) into the exhaust to burn any unburnt gases. Depend on your states laws, you may, or may not remove this system.
Thank You
Thread Starter
6th Gear
Joined: Jul 2013
Posts: 6
Likes: 0
Maf
Safety Car
Joined: Aug 2009
Posts: 3,751
Likes: 275
From: Melbourne, Victoria, Australia
Headers just gave more power mid range to top end, totally changed the car. Food for thought
