LT1 Engine Swap
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2nd Gear
Joined: Sep 2016
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LT1 Engine Swap
Hello everyone, I'm new to the forum and Corvettes as well. I picked up a 1977 corvette that needs some work. I'm swapping a 1994 LT-1 into the car and have a few questions.
1) am I going to need new fuel lines to go from a carbed engine to fuel injections? If so, what would be my best option for replacement lines?
2) when removing the engine from the donor car the pipe/hose on the back near the EGR broke. It was GM part number 12551318, but every place I've found it listed says it's discontinued, is there a site that sells discontinued parts?
Thanks!
1) am I going to need new fuel lines to go from a carbed engine to fuel injections? If so, what would be my best option for replacement lines?
2) when removing the engine from the donor car the pipe/hose on the back near the EGR broke. It was GM part number 12551318, but every place I've found it listed says it's discontinued, is there a site that sells discontinued parts?
Thanks!
Drifting
Joined: Aug 2006
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From: Scottsdale Arizona
Thread Starter
2nd Gear
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Thank you!
Team Owner
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From: Southbound
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Yes, you need a 3/8" feed and return line as well as a good electric fuel pump setup so the pump never sucks air. Lots of people just run an inline pump and then the engine stumbles when the tank is low and they corner, accelerate and/or brake.
The best option is to install a properly setup EFI tank. You can also install a surge tank which stores a small amount of fuel for the fuel pump. The LT1 has no provision for a fuel pump so you do have to switch to an electric pump from the fuel tank.
On another note, I don't believe the Camaro or B-Body accessory drive setup will clear the C3 a-arm on the passenger side. The belt will hit.
Agreed. You'll likely want to re-program the PCM to remove the VATS so you can get the EGR properly deleted at the same time. It has to be deleted correctly or the self-learning of the PCM gets screwed up. You're also likely going to change the manifolds so that tube won't fit anyways. I probably have that part in my garage still attached to the manifold.
The best option is to install a properly setup EFI tank. You can also install a surge tank which stores a small amount of fuel for the fuel pump. The LT1 has no provision for a fuel pump so you do have to switch to an electric pump from the fuel tank.
On another note, I don't believe the Camaro or B-Body accessory drive setup will clear the C3 a-arm on the passenger side. The belt will hit.
Agreed. You'll likely want to re-program the PCM to remove the VATS so you can get the EGR properly deleted at the same time. It has to be deleted correctly or the self-learning of the PCM gets screwed up. You're also likely going to change the manifolds so that tube won't fit anyways. I probably have that part in my garage still attached to the manifold.
Last edited by lionelhutz; Sep 6, 2016 at 06:28 PM.
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The later vacuum vented Optispark isn't as bad as the reputation. You can find many B-body cars that went 100's of thousands of miles on a single unit. But, the Optispark on the 94 engine is the first design atmosphere vented unit which proved to have reliability issues due to moisture getting inside. You can modify the 94 one to use vacuum venting if you really want to. If you drive the car in nice weather then it doesn't matter.
Safety Car
Joined: Oct 2008
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From: Los Angeles CA
Hello everyone, I'm new to the forum and Corvettes as well. I picked up a 1977 corvette that needs some work. I'm swapping a 1994 LT-1 into the car and have a few questions.
1) am I going to need new fuel lines to go from a carbed engine to fuel injections? If so, what would be my best option for replacement lines?
2) when removing the engine from the donor car the pipe/hose on the back near the EGR broke. It was GM part number 12551318, but every place I've found it listed says it's discontinued, is there a site that sells discontinued parts?
Thanks!
1) am I going to need new fuel lines to go from a carbed engine to fuel injections? If so, what would be my best option for replacement lines?
2) when removing the engine from the donor car the pipe/hose on the back near the EGR broke. It was GM part number 12551318, but every place I've found it listed says it's discontinued, is there a site that sells discontinued parts?
Thanks!
Dr. Detroit
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From: New Braunfels Texas
Le Mans Master
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These guys say they have on in stock. http://oemcats.com/oem-parts/12551318.html
oemcats dot com/ oem-parts/ 12551318.html
give them a yell and see if it's true. You may have to fabricate one. Do you still have the ends that bolt on? Might be worth it to fabricate with some of that high temp flexible tubing....
oemcats dot com/ oem-parts/ 12551318.html
give them a yell and see if it's true. You may have to fabricate one. Do you still have the ends that bolt on? Might be worth it to fabricate with some of that high temp flexible tubing....
Last edited by carriljc; Dec 16, 2019 at 11:02 PM.
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back to the subject of fuel lines. ypur 40 year old line was designed for use under negative pressure. slight vacuum as fuel is being sucked by pump at engine block. rust. stress cracks. stone damage. then you put 60 psi on that old fuel line? spraying gas all over your exhaust? people use rubber fuel injection hose the length of the car when doing efi conversions and have no issues. just route it and secure it well.