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Carbureted Vortec Swap Questions

Old 09-06-2018, 03:12 PM
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Carbureted Vortec Swap Questions

Hello, I have a stock 1984 Trans Am with a LG4 305 and a T5 transmission. I've been thinking about doing a cheap-ish swap to a Vortec 350 from a late 1990's truck, which seems like it wouldn't be that hard to do, but I do have some questions (yes, I searched the forums). Most of my questions are carb related so I figured I would ask here and not in the swap section:

I've read that the 4 barrel quadrajet off of the 305 will work alright on the 350 but how much will I have to change it to get it to function properly on the 350 and what other issues will I have because I believe the carb is computer controlled? I've researched this online but have yet to find a definite answer.

I'm hoping to find a low enough rise intake for the Vortec that I can still use the stock cowl induction hood setup if possible. I really don't want to use a higher hood because I like the stock hood. Does anyone know if there is a Vortec carbed intake low enough to fit?

Can someone recommend an electric fuel pump and a regulator that will work well with this setup?

Will the HEI off of my 305 work in the newer Vortec or will I need a different distributor?

Yes, I'm aware that the T5 isn't the strongest but I'm planning on babying it until I can afford a T56. The one piece rear seal on the newer engine will require me to use a 1986+ flex plate from what I've read.

Sorry for all of the questions but I just want to be prepared for what I will be in for doing a swap like this.

Thank you!
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Old 09-07-2018, 08:57 AM
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Car: 1984 Trans Am L69
Engine: 355 Carbed V8 Patriot Vortec Heads
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Carbureted Vortec Swap Questions

The carb is computer controlled and will work for a stock L31. You may need to swap the rods but that is an ez job.
http://www.superchevy.com/how-to/add...b-in-corvette/


I think the performer spreadbore will work just fine
https://www.speedwaymotors.com/Edelbrock-2116-Performer-Vortec-Small-Block-Chevy-Intake,51604.html?sku=3252116&utm_medium=CSEGoogle&utm_source=CSE&utm_campaign=CSEGOOGLE&gclid=EAIaIQobChMIoY3m14Wp3QIVkcDICh2BLQyJEAQYBiABEgI3IvD_BwE

You may need a new gear on the bottom of the distributor I cannot recall what is on the factory one but the vortec motor is a roller motor and they use a different material cam gear.

Get a 86+ flywheel and clutch I usually just say 1990 camaro
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Old 09-07-2018, 02:51 PM
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Re: Carbureted Vortec Swap Questions

That helps, thank you!
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