I'm planning to rebuild a 350 with Vortec heads. However, I want to keep it TBI. The factory throttle body isn't large enough. So I was thinking about buying a 454 throttle body for it. Would it work? I know I would need to bore out the manifold to 2 inches. Is there anything else to worry about?

 

Ideally the bores of the intake manifold must at least match the ones of the TB.

TGO member dctrumpet should have everything you need to switch over to the 454 TB, on he's ebay store.

 

Match the injectors to the build. 454 injectors are likely too big.

You'll need a custom tune for new tb as well.

 

I have run a 7.4L TB with 75 lb injs on my 350 for years.

If fact I just bought all needed to go to port fuel. I will hav the holley projection manifold, TB, and injectors for sale soon. Just need to find a few $$$ to replace what I stole out of my savings/retirement account

 

^ what's your specs? I'm guessing it's not a stock 350?

 

edelbrock rpm late edition 64 cc alum heads, crane roller rockers 224/230 @.05 114 LSA
100 HP shot N20 hedman 1 5/8 headers real duals 2.25 hooker aerochambers Innovate WB EBL-ECU

 

Where do I get a tune?

 

Where did you get your tbi tuned?

 

Like most of us we tune them ourself.

 

Like i said in your other thread, check out http://www.dynamicefi.com/

 

Wow... I'll highly consider this. What kind of throttle body do you use?

 

I usually run Marine throttle bodies I have adapted over. They have 2" bore late model 454 style castings and 30 psi regulators.