420A 2GNT Throttle body options?

[Redpest850]

I'm thinking about buying a new throttle body for my car. I've seen a 55mm and a 60mm throttle body for my car. I'm curious, if i get a 60mm throttle body do i HAVE to bore out the intake manifold, or buy a new intake manifold? OR will it fit perfectly without changing anything else? I'm wondering because my dad was looking to get a bigger throttle body for his firebird, but someone told him that he had to bore out the intake manifold to make it fit properly. I'm curious if i have to do the same thing, or not. I plan to get a new intake manifold later, when i get more money, but i found a 60mm throttle body for $200 and thought it would be best to buy that first. But if the 60mm throttle body doesn't fit i guess i will have to buy a new intake manifold first. If someone can answer my question, it will really help me out alot. Will i have to buy a new/ bore out the intake manifold to make a 60mm throttle body fit properly?
THANKS

 

[yoshimitsuspeed]

Are these stock eclipse parts? Or they aftermarket?
Do you have any pics, info, brand, ect.

 

[turbolarry]

You don't have to bore it out, but it would seriously interupt air flow if you didn't. As long as it bolts up, do this;

http://www.roadraceengineering.com/2gtbswap.htm

 

[yoshimitsuspeed]

You don't have to bore it out, but it would seriously interupt air flow if you didn't. As long as it bolts up, do this;

http://www.roadraceengineering.com/2gtbswap.htm

Yes but that's a 4g63 mod, he has a non turbo.I am wondering if he is looking at the same parts though. that's why I asked for more info. I don't think either of those throttle bodys will fit a 420 motor but I don't know for sure.

 

[Redpest850]

sorry about not answering quickly...i found the answer to my question about a minute after i posted. I bought a throttle body off of maximumperformance.com. I got a 60 mm tb, i was told that it would bolt up and fit properly so i installed it. The 60mm throttle body really helps, i like it alot...it seems like the gas pedal is so easy to press now. And when i barely push the gas pedal, i get a really good throttle response, now i have to change my driving habits so i don't screech my tires when coming out of a stop, . Here's a pick. And actually the butterfly looks different than that....the black part covers the whole side of it, not metal. Thanks tho.

 

[Eclipsemblue]

58mm bored over costed me 15 dollars, no need for a after market just a waiste of money i saw it as.

www.conceptillusions.com

 

[GILZTSIAWD]

throttle body off of a jeep will fit, the 4.0 cherokee i believe it is.....