350 w/454TBI ??

[venaka]

Hey guys, i just bought a 350 5.7 89 silverado short bed w/od.
And they guy that sold it to me gave me a 454 throttle bod...Will this work fine on my 350????

EX WRX DRIVER..FINALLY FEEL MANLY

[venaka]

please any1 , will a 454 tbi work with a 350???

[venaka]

well i just spoke w/ extreme1 and they said that the 454 ill work fine if u do it right(chip)...

[Whifflebat]

and you have to change the injectors... search it, theres a few posts on it.

[2nd Time Round]

Put the 350 injectors in and up the fuel pressure. You'll also have to do something about the IAC motor and Throttle Position Sensor as these are different between the Throttle bodies. Turbo City has adapters for those that'll run you about $25.95 for the IAC and $12.95 for the TPS adapters.

You'll also need to port or bore the intake openings on your TBI manifold or use an adapter if using a 4 bbl. carb mainfold.

This is all that I can think of at the moment.

[oldred95]

If the rest of the engine is stock then just leave the stock throttle body in place, going bigger will do nothing. Until there is a need for more incoming air there is no need for the bigger throttle body.

[Greenbuggy]

Put the 350 injectors in and up the fuel pressure. You'll also have to do something about the IAC motor and Throttle Position Sensor as these are different between the Throttle bodies. Turbo City has adapters for those that'll run you about $25.95 for the IAC and $12.95 for the TPS adapters.

A TPS from a 4.3/305/350 TBI will bolt to the 454 TBI and work just fine. I put up info on my site on how to wire a 454 TBI IAC to a 350 harness:
http://www.speedyoldtruck.com/index.php?page=454tbi

You'll also need to port or bore the intake openings on your TBI manifold or use an adapter if using a 4 bbl. carb mainfold.

This is all that I can think of at the moment.

Check the page I linked to above, has info on which vehicles you can score the quadrajet manifold out of, otherwise turbo city sells both square bore (carter) and spread bore (Qjet) TBI adapters.

[FergieZ71]

and you have to change the injectors... search it, theres a few posts on it.

NO NO NO NO NO, you don't have to change injectors. I have it done to my truck. All you have to do it take your intake off and bore out the hole to allow for more air, then you have to go get a chip burned so you don't flood out your engine. But don't change your injectors or you defeate the whole purpose of putting a bigger throttle body on it. It makes for a hell of alot of power. trust me. you will not be dissapointed.
Fergie

[venaka]

NO NO NO NO NO, you don't have to change injectors. I have it done to my truck. All you have to do it take your intake off and bore out the hole to allow for more air, then you have to go get a chip burned so you don't flood out your engine. But don't change your injectors or you defeate the whole purpose of putting a bigger throttle body on it. It makes for a hell of alot of power. trust me. you will not be dissapointed.
Fergie

Hey I appreciate every1's knowlede on this,,,
Ferge, you talk about getting a chip burned..who do you recommend ,,that will not charge an arm ..extremef1??

[FergieZ71]

Hey I appreciate every1's knowlede on this,,,
Ferge, you talk about getting a chip burned..who do you recommend ,,that will not charge an arm ..extremef1??

I would recommend Hypertech. I dont know where you live. I got mine burned from a buddy of mine that lives right down the road from my shop. But I would recomend hypertech. Just give them a call and they will be able to do it for you, also they wont charge you that much for it. I got mine burned for $150. But I live in Moore, Oklahoma, right outside of Oklahoma City. if you live in this area i will tell him. But anywhere else I would just say hypertech... They are awesome with that stuff. Also if you are planning on getting a cam or anything else, tell them and they will recalibrate everything. If you have any questions, just ask.

[oldred95]

I think tbichips.com would be the better choice for a custom chip.

Fergie, what other mods do you have and how did the bigger throttle body effect gas mileage? Was the power night and day difference or just enough you can tell its not stock?

[bobzilla75]

Since when did Hyper ping start doing custom chips? Their off the shelf chips are hit or miss when it comes to performance gains. tbichips are quite a bit less and he guarantees his product. That's where I'll be going. Wans't very impressed with Hyperping personally.

[venaka]

Since when did Hyper ping start doing custom chips? Their off the shelf chips are hit or miss when it comes to performance gains. tbichips are quite a bit less and he guarantees his product. That's where I'll be going. Wans't very impressed with Hyperping personally.

HYPERPING...Thats funny Meng..
WELL I wrote to TBICHIPS and he's a great guy..
Ill B going with Him whenever im done with my mods, But he better do a custom one for my 454 Throttle Bod and other mods...I know he told me he didnt think the 454 TB wasnt a good idea, BUt my buddie has one on his 350 just w/ headers and exhaust and it runs like a chevy on roids...

[venaka]

I think tbichips.com would be the better choice for a custom chip.

Fergie, what other mods do you have and how did the bigger throttle body effect gas mileage? Was the power night and day difference or just enough you can tell its not stock?

HEY ILL BE ADDING FULL exhaust (magnaflow), headers, 1.6 Rockers, and the 454 TB in about 2 weeks...and then the TBICHIP(if he burns me one with what i want)
Ill post everything i needed to add for the 454 to work properly later....

DANG i feel sorry for the Subaru WRX in my garage

[oldred95]

HEY ILL BE ADDING FULL exhaust (magnaflow), headers, 1.6 Rockers, and the 454 TB in about 2 weeks...and then the TBICHIP(if he burns me one with what i want)
Ill post everything i needed to add for the 454 to work properly later....

DANG i feel sorry for the Subaru WRX in my garage

If I go with a bigger throttle body I will just buy another 350 TB off ebay or somewhere and get it bored and put 454 butterflies on it. I like the idea of plug and play.

[2nd Time Round]

A TPS from a 4.3/305/350 TBI will bolt to the 454 TBI and work just fine. I put up info on my site on how to wire a 454 TBI IAC to a 350 harness:
http://www.speedyoldtruck.com/index.php?page=454tbi



Check the page I linked to above, has info on which vehicles you can score the quadrajet manifold out of, otherwise turbo city sells both square bore (carter) and spread bore (Qjet) TBI adapters.

Cool.

[91_bowtie]

NO NO NO NO NO, you don't have to change injectors. I have it done to my truck. All you have to do it take your intake off and bore out the hole to allow for more air, then you have to go get a chip burned so you don't flood out your engine. But don't change your injectors or you defeate the whole purpose of putting a bigger throttle body on it. It makes for a hell of alot of power. trust me. you will not be dissapointed.
Fergie

If your purpose is to "allow for more air," then why leave the stock intake on the motor? All you're doing is moving the bottleneck a little further down stream. Using the 85lb injectors is a waste on a stock motor. You will never require the amount of fuel that a pair 85lb injectors will flow. Your stock injectors are only 55lb. You can do the math on your own.

On a stock motor, I don't trust you. I know he will be dissapointed. One of the good things about the lo5 is the low end torque. You will eliminate a great deal of it, if you use the 2" tbi on a near stock motor. Tune it all you want, but you're wasting time and money.