C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Lt1 carb conversion progress

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Old Feb 5, 2025 | 08:41 PM
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Default Lt1 carb conversion progress

Well got my intake in. And installed, waiting on carb and dizzy to get here, figure I'd start a progress thread if anyone was interested. Also got my wifes 4l60 tore down and parts ordered to rebuild.

also. On
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Old Feb 6, 2025 | 11:10 AM
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I'm curious why change from the fuel injection to a carb?
What intake did you use? Is it a standard SBC intake, or something modified/special?
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Old Feb 6, 2025 | 11:45 AM
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Originally Posted by Corvette_Dez
I'm curious why change from the fuel injection to a carb?
What intake did you use? Is it a standard SBC intake, or something modified/special?
had a CCM problem and lot of wire issues with the fuel injection system. Plus ecms were problems in this year.
it's a gm intake meant for carb swap a lt1. Has no coolant running through intake as the thermostat sits on top of waterpump. Here is ebay link I used it came from summit
https://www.ebay.com/itm/39417859665...mis&media=COPY
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Old Feb 6, 2025 | 02:55 PM
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Seeing these pictures of carb swapping an LT1, I feel like I'm watching someone kick a puppy.

I'm just picking.

I am however glad to see that I'm not the only one who whenever they rebuild a transmission it looks like it threw up all over my bench.
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Old Feb 6, 2025 | 06:07 PM
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Originally Posted by Phobos84
Seeing these pictures of carb swapping an LT1, I feel like I'm watching someone kick a puppy.

I'm just picking.

I am however glad to see that I'm not the only one who whenever they rebuild a transmission it looks like it threw up all over my bench.
🤣🤣🤣🤣
Yep transmission always look like junkyard till back together
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Old Feb 6, 2025 | 06:36 PM
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So many questions

what are you doing for a fuel pump?


i wonder if that intake manifold design will be better vs. lt1 intake (more TQ) up to a 6500 rpm range

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Old Feb 6, 2025 | 06:42 PM
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Originally Posted by dizwiz24
So many questions

what are you doing for a fuel pump?


i wonder if that intake manifold design will be better vs. lt1 intake (more TQ) up to a 6500 rpm range
running a holly external pump, a fuel pressure regulator.
hei distributor with melonized gear.
Holley 600 or 650 haven't decided yet.
Making my own dash cluster with aftermarket gauges..
Ill keep posting pics as parts come in and installed
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Old Feb 7, 2025 | 12:44 PM
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Originally Posted by Vetteman1939
running a holly external pump, a fuel pressure regulator.
hei distributor with melonized gear.
Holley 600 or 650 haven't decided yet.
Making my own dash cluster with aftermarket gauges..
Ill keep posting pics as parts come in and installed
You may be the guy to answer some questions I have...

I started a thread about an engine swap mostly to eliminate the ecm....

I don't trust the electricle distributor any more than I trust the ECM.... it would be nice to be able to wash my engine....

https://www.corvetteforum.com/forums...d-1992-c4.html
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Old Feb 7, 2025 | 01:12 PM
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Originally Posted by AngelDeville
.. it would be nice to be able to wash my engine....
After I LS swapped my 84 I wash my engine all the time...just sayin
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Old Feb 20, 2025 | 08:45 AM
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Been a little while since update, been busy at work not much time to work on my own, but have got my holley carb and got it apart waiting on trick kit to show up.
got my distributor in and its a tight fit lol. Wires and fuel pump are in the mail. Soon should be up and running.

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Old Feb 20, 2025 | 05:04 PM
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Awesome project...I love it! It sure makes life simpler and the car a lot easier to work on. Keep posting.

Also, a 600 or 650 carb? Ain't that a little small, especially if you add a cam and headers later on?

Please put some real plugs in the exhaust manifold. Look here for inspiration.
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Old Feb 20, 2025 | 05:44 PM
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Originally Posted by rremesal
Awesome project...I love it! It sure makes life simpler and the car a lot easier to work on. Keep posting.

Also, a 600 or 650 carb? Ain't that a little small, especially if you add a cam and headers later on?

Please put some real plugs in the exhaust manifold. Look here for inspiration.
yep definitely putting plugs in exhaust the 600 holley is good for me right now,got a great deal on it. i plan on doing upgrades later after some suspension work and a paint job, and then ill put a bigger carb on it.
got alot on my plate car fixing wise with my wifes needing work too so going as cheap as I can right now without using junk parts
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Old Feb 20, 2025 | 09:00 PM
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Originally Posted by Vetteman1939
yep definitely putting plugs in exhaust the 600 holley is good for me right now,got a great deal on it. i plan on doing upgrades later after some suspension work and a paint job, and then ill put a bigger carb on it.
got alot on my plate car fixing wise with my wifes needing work too so going as cheap as I can right now without using junk parts
Got it.
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Old Feb 22, 2025 | 06:32 PM
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Finished rebuilding my carb today, going take it to the shop Monday and install it, getting close


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Old Feb 24, 2025 | 07:04 PM
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Got some more done, waiting on fuel pump and throttle cable. Gotta clean wires up more but getting closer

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Old Feb 25, 2025 | 01:19 PM
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What year car is this?

Auto or manual?

Besides the pump, what else do you need to get running?

What are you doing with the Opti?

Is the carb/filter going to fit under the stock hood?

EDIT: Why is the throttle body still hanging in there? Come on, man...erase all evidence this thing was ever FI.
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Old Feb 25, 2025 | 02:02 PM
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Originally Posted by rremesal
What year car is this?

Auto or manual?

Besides the pump, what else do you need to get running?

What are you doing with the Opti?

Is the carb/filter going to fit under the stock hood?

EDIT: Why is the throttle body still hanging in there? Come on, man...erase all evidence this thing was ever FI.
6 spd manual, just waitng on fuel pump to come in.. using a intank pump from a chevy vega,
waiting on throttle cable aswell.
carb and filter will fit under hood. opti wil be blocked off with a block off plate.
Throttle body is only there because of coolant lines that go through it. Im not ready to drain coolant just yet until i get fitting to connect those those 2 lines going through throttle body. It'll be gone when I get it ready to drive.
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Old Feb 25, 2025 | 02:39 PM
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We need a video of it driving.

I love this project!
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Old Feb 25, 2025 | 02:51 PM
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Originally Posted by dizwiz24
So many questions

what are you doing for a fuel pump?


i wonder if that intake manifold design will be better vs. lt1 intake (more TQ) up to a 6500 rpm range
On my L98, I used a Carter Crossfire Injection fuel pump that puts out 12 psi. A regular regulator will knock that down to wherever you want it. The fuel pump was a measly $30 off fleaBay brand new.

I had similar reasons to convert to carb on my car as the OP did: Crappy condition of the wiring mainly.
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Old Feb 25, 2025 | 03:20 PM
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Originally Posted by rremesal
We need a video of it driving.

I love this project!
I will as soon as I can and thanks I like it too
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