305 Tbi to 350 vortec swap
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Joined: May 2013
Posts: 24
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From: Grand Rapids MI.
Car: 88 Firebird Formula W/T-Tops
Engine: 5.0 (305)
Transmission: Auto
305 Tbi to 350 vortec swap
Hi, I have a 88 firebird formula with a 305 tbi, I bought a 350 vortec out of a 99 Yukon and I plan on doing a swap, I know I will probably need a new intake manifold ( don't know which, if on a budget) , but what else would I need and what problems will I run into? I'm hoping it will bolt right up, what are my chances of that? Any help is appreciated, thanks.
Joined: Dec 2004
Posts: 16,895
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 305 Tbi to 350 vortec swap
you will need a tbi vortec intake like a edelbrock 3704 or gmpp 12496821. You will also need to install 55#hr injectors and have a prom programed .Changing the ecm from the 1228063 to the 122746 would be a good upgrade as well.
Re: 305 Tbi to 350 vortec swap
2912 for Vortec http://www.edelbrock.com/automotive_...ictor-sb.shtml
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Joined: Jun 2013
Posts: 2
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From: madoc ontario
Car: 1988 RS Camaro
Engine: 305 & 350
Transmission: 5 speed
Re: 305 Tbi to 350 vortec swap
ok guys i need some ideas. ok so i have a 1988 305 tbi 5 speed in wich i changed the stock exaust to headers with 3" pipes all the way back and now when i wanna put my foot to the floor it seems hesitate in 5th gear. i have also removed poultion pump crap. i guess i wanna know if messed somthing up or if i need to get more air down the intake because i opened up the exaust. friend said to check the egr valve haven't yet just wanna see what other people say
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Joined: Aug 2003
Posts: 506
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From: pnw near portland or.
Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
Re: 305 Tbi to 350 vortec swap
I just got done doing that swap and it wasn't as easy as it should be. Start with reading the sticky about putting a 350 in place of the 305. There is alot to do if you want to keep the TBI. It isn't cheep that is to do it right. The guys on this form have walked me through it and answered all my questions.
Good Luck
Good Luck
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Posts: 1,873
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From: OC CA
Car: 75 Beast
Engine: 383 +EBL Flash
Transmission: 700R4
Axle/Gears: 4.11 with 33"
Re: 305 Tbi to 350 vortec swap
//RF
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iTrader: (1)
Joined: Aug 2003
Posts: 506
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From: pnw near portland or.
Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
Re: 305 Tbi to 350 vortec swap
Kush
This is a great place for info but... pay attention to who you take advice from. The guys that help me most have been around the block and are nominally supreme members. If it wasn't for these guys I would have never gotten it done. Read the sticky in the section about what you need to do the swap. Then decide if you want to do it, I am done except the finish tune and it is the most expensive car I've done.
Greg
This is a great place for info but... pay attention to who you take advice from. The guys that help me most have been around the block and are nominally supreme members. If it wasn't for these guys I would have never gotten it done. Read the sticky in the section about what you need to do the swap. Then decide if you want to do it, I am done except the finish tune and it is the most expensive car I've done.
Greg
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