Bored Out 454 TB
02-25-2003, 08:03 AM
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Car: 90 454SS
Engine: 454 TBI
Transmission: TH400
Bored Out 454 TB
I haven't had time to read all the related threads, but I'm gonna throw this out anyway.
I hear mention of using 454 TB's. I'm a member of the NATC, which is dedicated to the 90-93 BB trucks. We have a member that bores and sleeves 454 TB's. The bore size is 56 mm and the throttle shaft is reduced to 4.8 mm. Go to www.454ss.com and look in the gallery section. Check out Jim Dickie's section. He gives a detailed explanation of this mod.
I am currently using one of these TB's on my truck and it is awesome! Jim can also modify intakes/adapters/spacers to use with the modified TB. Contact Jim for pricing.
I've also heard mentioned of higher flow injectors, but none of our members have been able to source any. Where are you getting these?
Bill
I hear mention of using 454 TB's. I'm a member of the NATC, which is dedicated to the 90-93 BB trucks. We have a member that bores and sleeves 454 TB's. The bore size is 56 mm and the throttle shaft is reduced to 4.8 mm. Go to www.454ss.com and look in the gallery section. Check out Jim Dickie's section. He gives a detailed explanation of this mod.
I am currently using one of these TB's on my truck and it is awesome! Jim can also modify intakes/adapters/spacers to use with the modified TB. Contact Jim for pricing.
I've also heard mentioned of higher flow injectors, but none of our members have been able to source any. Where are you getting these?
Bill
02-25-2003, 12:13 PM
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Re: Bored Out 454 TB
Originally posted by va454ss
I haven't had time to read all the related threads, but I'm gonna throw this out anyway.
I hear mention of using 454 TB's. I'm a member of the NATC, which is dedicated to the 90-93 BB trucks. We have a member that bores and sleeves 454 TB's. The bore size is 56 mm and the throttle shaft is reduced to 4.8 mm. Go to www.454ss.com and look in the gallery section. Check out Jim Dickie's section. He gives a detailed explanation of this mod.
I am currently using one of these TB's on my truck and it is awesome! Jim can also modify intakes/adapters/spacers to use with the modified TB. Contact Jim for pricing.
I've also heard mentioned of higher flow injectors, but none of our members have been able to source any. Where are you getting these?
Bill
I haven't had time to read all the related threads, but I'm gonna throw this out anyway.
I hear mention of using 454 TB's. I'm a member of the NATC, which is dedicated to the 90-93 BB trucks. We have a member that bores and sleeves 454 TB's. The bore size is 56 mm and the throttle shaft is reduced to 4.8 mm. Go to www.454ss.com and look in the gallery section. Check out Jim Dickie's section. He gives a detailed explanation of this mod.
I am currently using one of these TB's on my truck and it is awesome! Jim can also modify intakes/adapters/spacers to use with the modified TB. Contact Jim for pricing.
I've also heard mentioned of higher flow injectors, but none of our members have been able to source any. Where are you getting these?
Bill
As for injectors the largest I know of are 90pph. Bumping the fuel pressure to 16-20psi will net a bit more flow.
My understanding is that there are larger injectors then these. They are for export vehicles running alcohol. I have not yet been able to verify this.
RBob.
02-25-2003, 02:49 PM
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I went there and searched all around and didn't find anything about a bored out TBI, or Jim Dickie, or anything of the sort 
02-25-2003, 02:58 PM
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Car: 88 Camaro SC
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Axle/Gears: 9-bolt w/ 3.23's
man that thing is dope... It lookes like it would be a pita top get it to fit under the stock hood with a carb to tbi adapter, though... i want one. Shame it cant be used easily with the fuel injectors.
02-25-2003, 04:00 PM
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Car: Bee-Bowdy
Engine: blowd tree-fity
Transmission: sebin hunnerd
Axle/Gears: fo-tins
Originally posted by dimented24x7
go here... bb tbi
go here... bb tbi
With the MPFI on there why didn't the guy just buy a 4 bbl TB from Holley? He would've saved money and got 200 more cfm...
Last edited by V8Astro Captain; 02-25-2003 at 04:09 PM.
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02-25-2003, 06:41 PM
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Car: 90 454SS
Engine: 454 TBI
Transmission: TH400
Originally posted by dimented24x7
man that thing is dope... It lookes like it would be a pita top get it to fit under the stock hood with a carb to tbi adapter, though... i want one. Shame it cant be used easily with the fuel injectors.
man that thing is dope... It lookes like it would be a pita top get it to fit under the stock hood with a carb to tbi adapter, though... i want one. Shame it cant be used easily with the fuel injectors.
Bill
02-25-2003, 06:51 PM
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Car: 90 454SS
Engine: 454 TBI
Transmission: TH400
Re: Re: Bored Out 454 TB
Originally posted by RBob
Wow, I'll bet the 56mm bores help out. My only question is what is used to funnel the bore width to the manifold? (I'll hit the web site next). I've had trouble getting a 52mm bore on the square form 4bbl manifold.
As for injectors the largest I know of are 90pph. Bumping the fuel pressure to 16-20psi will net a bit more flow.
My understanding is that there are larger injectors then these. They are for export vehicles running alcohol. I have not yet been able to verify this.
RBob.
Wow, I'll bet the 56mm bores help out. My only question is what is used to funnel the bore width to the manifold? (I'll hit the web site next). I've had trouble getting a 52mm bore on the square form 4bbl manifold.
As for injectors the largest I know of are 90pph. Bumping the fuel pressure to 16-20psi will net a bit more flow.
My understanding is that there are larger injectors then these. They are for export vehicles running alcohol. I have not yet been able to verify this.
RBob.
I am switching over the RPM Air Gap as soon as I get my heads finished. The TB will be mated to the intake with the Holley adapter (also bored out).
Bill
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