79 Virgin
Thread Starter
Burning Brakes
Joined: Sep 2010
Posts: 799
Likes: 26
From: Lexington Park Maryland
79 Virgin
I decided to look for a winter project and maybe help a friend to get her first corvette. I found a 79 with L48 with 47K original miles. I am not sure if it's a dilemma or just want to removed all the stock system.
It still has all the vacuum emission stuff and all the factory covering for the plug wires.
What benefit does the factory vacuum system on the intake manifold that controls the EGR and the valve on the passenger side exhaust manifold.
I am planning on removing all of that and also switching to an open type air filter vise the dual snorkel stock intake. Is this something beneficial or keep everything? Thanks in advance
It still has all the vacuum emission stuff and all the factory covering for the plug wires.
What benefit does the factory vacuum system on the intake manifold that controls the EGR and the valve on the passenger side exhaust manifold.
I am planning on removing all of that and also switching to an open type air filter vise the dual snorkel stock intake. Is this something beneficial or keep everything? Thanks in advance
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
You can disconnect whatever you like, but you will not be gaining any horsepower, if that's what you're hoping. Swapping to the open element air cleaner will also not help much on its own.
Why not leave the car as it is, tune it, and drive it for a while before deciding what you want to do with it? You may you like it as it is.
Why not leave the car as it is, tune it, and drive it for a while before deciding what you want to do with it? You may you like it as it is.
Thread Starter
Burning Brakes
Joined: Sep 2010
Posts: 799
Likes: 26
From: Lexington Park Maryland
You can disconnect whatever you like, but you will not be gaining any horsepower, if that's what you're hoping. Swapping to the open element air cleaner will also not help much on its own.
Why not leave the car as it is, tune it, and drive it for a while before deciding what you want to do with it? You may you like it as it is.
Why not leave the car as it is, tune it, and drive it for a while before deciding what you want to do with it? You may you like it as it is.
Last edited by newbie2vette; Jan 5, 2016 at 03:01 PM.
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
The stock exhuast is all rusted with holes on the pipes to the muffler. There's a "butterfly" on the right bank exhuast manifold. Is this something I can eliminate when I install the new dual exhaust system? there's a vacuum pot attached to the butterfly. What's the function of it? I do like the way it is, I just thought removing any restriction would help the efficiency.
Team Owner
Joined: Sep 2006
Posts: 31,109
Likes: 4,171
From: Westminster Maryland
Hi n2v,
It might be wise to get a Chassis Service Manual for this car so you'll have some idea what the various parts do and therefore what else might have to be done when parts are removed.
They might be various implications that won't be immediately obvious.
I'd think you wouldn't want to affect the drivability and reliability of the car since it since it seems like it might be going to someone else who's then going to have to maintain it.
Regards,
Alan
It might be wise to get a Chassis Service Manual for this car so you'll have some idea what the various parts do and therefore what else might have to be done when parts are removed.
They might be various implications that won't be immediately obvious.
I'd think you wouldn't want to affect the drivability and reliability of the car since it since it seems like it might be going to someone else who's then going to have to maintain it.
Regards,
Alan
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
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Burning Brakes
Joined: Jun 2005
Posts: 1,113
Likes: 35
From: LaUgH, mOrE!
I decided to look for a winter project and maybe help a friend to get her first corvette. I found a 79 with L48 with 47K original miles. I am not sure if it's a dilemma or just want to removed all the stock system.
It still has all the vacuum emission stuff and all the factory covering for the plug wires.
What benefit does the factory vacuum system on the intake manifold that controls the EGR and the valve on the passenger side exhaust manifold.
I am planning on removing all of that and also switching to an open type air filter vise the dual snorkel stock intake. Is this something beneficial or keep everything? Thanks in advance
It still has all the vacuum emission stuff and all the factory covering for the plug wires.
What benefit does the factory vacuum system on the intake manifold that controls the EGR and the valve on the passenger side exhaust manifold.
I am planning on removing all of that and also switching to an open type air filter vise the dual snorkel stock intake. Is this something beneficial or keep everything? Thanks in advance
The dual snorkel is an early version of a cold air intake. If all is intact, I recommend keeping it also.
Good luck and try to enjoy the beauty of the C-3.
Last edited by G-Sting; Jan 6, 2016 at 09:49 PM.
Burning Brakes
Joined: Jul 2015
Posts: 823
Likes: 57
From: Austin TX
I also live in a state that doesn't have emission testing for cars this age. However, that doesn't mean it's legal to remove the equipment. It's a crime under both state and federal statutes to alter emission-related equipment in any way. It is also a crime to sell a car that has been so altered. Inspectors here don't generally check under the hood, so lots of hot rodders get away with it. The first time a curious inspector decides to look though, you're hosed.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
My 78 is 2nd place for the fastest car I've ever owned, running the 78 L-48 single snorkel air cleaner.
Forward acceleration feels comparable to a 2002-2004 C5 Z06. The dual snorkel would only be better.
IMO, the only reason to get rid of the dual snorkel air cleaner is because you really need the hood clearance. The only better option I know of is the L-88 setup, which also draws cold air.
I do think axing the heat riser valve will help w/ power. The rest of the emissions components, not so much.
Forward acceleration feels comparable to a 2002-2004 C5 Z06. The dual snorkel would only be better.
IMO, the only reason to get rid of the dual snorkel air cleaner is because you really need the hood clearance. The only better option I know of is the L-88 setup, which also draws cold air.
I do think axing the heat riser valve will help w/ power. The rest of the emissions components, not so much.
Last edited by Shark Racer; Jan 7, 2016 at 01:26 AM.
Thread Starter
Burning Brakes
Joined: Sep 2010
Posts: 799
Likes: 26
From: Lexington Park Maryland
My 78 is 2nd place for the fastest car I've ever owned, running the 78 L-48 single snorkel air cleaner.
Forward acceleration feels comparable to a 2002-2004 C5 Z06. The dual snorkel would only be better.
IMO, the only reason to get rid of the dual snorkel air cleaner is because you really need the hood clearance. The only better option I know of is the L-88 setup, which also draws cold air.
I do think axing the heat riser valve will help w/ power. The rest of the emissions components, not so much.
Forward acceleration feels comparable to a 2002-2004 C5 Z06. The dual snorkel would only be better.
IMO, the only reason to get rid of the dual snorkel air cleaner is because you really need the hood clearance. The only better option I know of is the L-88 setup, which also draws cold air.
I do think axing the heat riser valve will help w/ power. The rest of the emissions components, not so much.
The re-build start today, all the parts to re-build both trailing arms arrived last night and the new yoke and half shaft. I even elected to go with the composite spring.
As far, as the dual exhaust. A kit is on its way.