350 TBI engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68cajun · 11-23-2003, 12:43 AM

Has anyone put a TBI engine in a 67-72, and if so what can be done to get around 300 hp out of one. I am thinking of building one with vortec heads and a stock vortec truck cam shaft with roller rockers and lifters. Also flat top pistons .030 over sized. If anyone has i would like to see a picture of it.

jorgensensc · 11-23-2003, 01:25 AM

I haven't heard many good things about TBI. If I were you I would go with TPI. The TBI setups end up squirting alot of gas on the butterflys, thus negating the effect of injection. So I've heard.

dinnut · 11-23-2003, 01:41 AM

people only say the bad things about them. they are actually good work engines. my dad has had his since 89 and hes pushed it and not taken very good care of it and hes at 130k with not much trouble. i just saw a supercharger in jegs catalog for the tbi chevys supposed to produe a BUNCH of power

68cajun · 11-23-2003, 10:45 AM

I have three complete engines with harness and computer sitting in my shop and would like to use one in my truck. They all need rebuilding. and two are 4 bolt mains. They are also the new style blocks that accept the oem roller cam and lifters.
I was thinking with vortec heads, flat top pistons, and a roller cam and lifters, along with a holley 670 cfm TBI with a bored intake i should be able to get 300 hp with decent fuel milage.
Is this relistic are am i dreaming.

68cajun · 11-23-2003, 10:47 AM

oh yeah and a chip in the computer.

my68beatertruck · 11-23-2003, 11:39 AM

someone will correct me if i'm wrong, but i think they were about 260 horse stock, so if you're doing a block up build, i see no reason you shuouldn't be able to push 300 horse. again, i've seen a lot of TBI engines go the mile without many, if any, problems, and still do decent mileage.

*racedvl* · 11-23-2003, 12:04 PM

I just finshed replacing the head gaskets on my 88 K1500 with a 5.7L TBI engine. It is the best this puppy has ever ran! I will have to admit that it now has some pretty smooth accelration and fair amount of power. It is no hot rod by far, but I'm pretty happy with it. As a matter of fact I was toying with the idea of building a 71/72 GMC 4x4 with a vortec headed TBI. But that is in the far future.

Kman · 11-23-2003, 12:36 PM

I dont know about the auto versions but the 5.7 vortec marine engines are stock with a holley carb are rated at 315 Hp at 4600-5000 rpm
Kman

lukecp · 11-23-2003, 12:45 PM

TBI 350's were rated in the 180-215 net HP range.

TBI is the simplest of the EFI systems. Basically just an electronic carb. It is actually pretty simple to work on, and dead reliable too. But multipoint EFI of some kind will give you much better power and MPG.

adamls · 11-23-2003, 02:59 PM

had a six cylinder TBI in an S-15, drove it for 300K before selling for a bigger truck and it was running great

68cajun · 11-23-2003, 03:47 PM

I know they are pretty dependable, and fairly efficient. I just wasn't sure about the horsepower i could get out of it. I don't want anything to wild just around 300 hp. I plan on using the truck as a weekend cruiser. I have been down the road of high horsepower with an 86 short bed, fleetside pushing around 450hp. It was fun, but expensive, and not all that reliable. I will continue to look for an TPI or MPI setup while i build the truck. But if i don't find one at a resonable price i think i will try the TBI. Thanks for the input.

jorgensensc · 11-23-2003, 03:47 PM

Not trying to start anything here, but there IS a difference between:
TBI:Throttle Body injection (Early form, as stated above)
CPI:Central port Injection (Used in s10 blazers in 93 and a few other years, and I'm sure on other vehicles)
MPI:Multi Port Injection (very good system)
TPI:Tuned Port Injection(excellent system
I don't claim to know everything, but I do know there is a big difference between these systems. Maybe someone else can offer a little more insight.

*redbowtie* · 11-23-2003, 04:06 PM

If you didn't have a TBI motor already it would be much better ta start with an L98 TPI motor (Z's and Vettes, 86-92) you can pick them up fairly cheap, and they run great, tons of TQ....

68c10owner · 11-23-2003, 07:13 PM

the 96-99 truck vortec 5.7 makes 255hp. would`nt take much to get it to 300. my old `99 x-cab had a 5.0 vortec with 235 hp and it was very powerfull. great motors.

dinnut · 11-23-2003, 09:32 PM

ive been wanting to know what those vortec engines made. 255 hp. thanks. thats what my moms sub has in it.

swdobbs · 11-24-2003, 01:11 AM

I right in the middle of a '93 TBI motor swap, matched injectors ramp plate, headwork, still undecided on what cam, Byan Herters reprogram... and I bet I'm at a solid 265 hp and getting 16mpg before I've spent $1000 total (including motor). That is why I went with a TBI instead of an overpriced LT1 donor. The optispark on an LT1 and the shear agravation of changing plug wires and dealing with OBDII is for people with deep pockets, lofty goals and nothing but time. But I do love my DGGM '94 b-body in SS trim.

Scott...

djracer · 11-24-2003, 02:15 AM

I have run a couple of vortec headed small blocks on TBI! The first one was a stroked 350 with vortec heads it ran extremely strong but was pretty hard to get the bugs out of! It took a year to get it to run as well as the 240k 350 I took out. The second one was in a 95 suburban and it ran decent but the computer made it run rich and I couldn't find the problem. So I took it out of the sub and put a zz4 cam in it with a 650 dbbl pumper and it runs great. now!

68cajun · 11-24-2003, 03:04 AM

swdobbs : Where do you plan to mount the ECM?

68cajun · 11-24-2003, 03:04 AM

swdobbs : Where do you plan to mount the ECM?
Also what harness are you using, stock, or aftermarket?

swdobbs · 11-24-2003, 08:12 PM

I have a bracket to locate the PCM above the glove box enclosure. The CEL and data plug are hung next to the ignition. This time I'm using a "Painless kit" ---101. The radiator requires a inlet for the heater core return.

Scott...

68cajun · 11-25-2003, 02:33 PM

ttt

11-23-2003, 12:43 AM	#1
68cajun 68 C/10 Join Date: Oct 2003 Location: Houma Louisiana Posts: 367	350 TBI engine Has anyone put a TBI engine in a 67-72, and if so what can be done to get around 300 hp out of one. I am thinking of building one with vortec heads and a stock vortec truck cam shaft with roller rockers and lifters. Also flat top pistons .030 over sized. If anyone has i would like to see a picture of it. __________________ (2009) GMC Sierra Denali 6.2 AWD (67 C/10 fleetside SWB) (2018GMC Yukon Denali) Wifes Car

11-23-2003, 01:25 AM	#2
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	I haven't heard many good things about TBI. If I were you I would go with TPI. The TBI setups end up squirting alot of gas on the butterflys, thus negating the effect of injection. So I've heard. __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

11-23-2003, 01:41 AM	#3
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	people only say the bad things about them. they are actually good work engines. my dad has had his since 89 and hes pushed it and not taken very good care of it and hes at 130k with not much trouble. i just saw a supercharger in jegs catalog for the tbi chevys supposed to produe a BUNCH of power __________________ 70 longbed 496/th400/Ford 9"

11-23-2003, 10:45 AM	#4
68cajun 68 C/10 Join Date: Oct 2003 Location: Houma Louisiana Posts: 367	I have three complete engines with harness and computer sitting in my shop and would like to use one in my truck. They all need rebuilding. and two are 4 bolt mains. They are also the new style blocks that accept the oem roller cam and lifters. I was thinking with vortec heads, flat top pistons, and a roller cam and lifters, along with a holley 670 cfm TBI with a bored intake i should be able to get 300 hp with decent fuel milage. Is this relistic are am i dreaming. __________________ (2009) GMC Sierra Denali 6.2 AWD (67 C/10 fleetside SWB) (2018GMC Yukon Denali) Wifes Car

11-23-2003, 10:47 AM	#5
68cajun 68 C/10 Join Date: Oct 2003 Location: Houma Louisiana Posts: 367	oh yeah and a chip in the computer. __________________ (2009) GMC Sierra Denali 6.2 AWD (67 C/10 fleetside SWB) (2018GMC Yukon Denali) Wifes Car

11-23-2003, 11:39 AM	#6
my68beatertruck GOT JACK??? Join Date: Aug 2003 Location: New Jersey Posts: 122	someone will correct me if i'm wrong, but i think they were about 260 horse stock, so if you're doing a block up build, i see no reason you shuouldn't be able to push 300 horse. again, i've seen a lot of TBI engines go the mile without many, if any, problems, and still do decent mileage. __________________ 68 C-10 250", 200R-4, LWB 04 F350 dually V-10, 6-spd 72 Cadillac Coupe DeVille

11-23-2003, 12:04 PM	#7
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	I just finshed replacing the head gaskets on my 88 K1500 with a 5.7L TBI engine. It is the best this puppy has ever ran! I will have to admit that it now has some pretty smooth accelration and fair amount of power. It is no hot rod by far, but I'm pretty happy with it. As a matter of fact I was toying with the idea of building a 71/72 GMC 4x4 with a vortec headed TBI. But that is in the far future.

11-23-2003, 12:36 PM	#8
Kman Registered User Join Date: Sep 2002 Location: Melbourne,Florida Posts: 174	I dont know about the auto versions but the 5.7 vortec marine engines are stock with a holley carb are rated at 315 Hp at 4600-5000 rpm Kman Attached Images __________________ New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect

11-23-2003, 12:45 PM	#9
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	TBI 350's were rated in the 180-215 net HP range. TBI is the simplest of the EFI systems. Basically just an electronic carb. It is actually pretty simple to work on, and dead reliable too. But multipoint EFI of some kind will give you much better power and MPG. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

11-23-2003, 02:59 PM	#10
adamls Gotta Startem Early Join Date: Oct 2001 Location: Amarillo, TX, USA Posts: 364	had a six cylinder TBI in an S-15, drove it for 300K before selling for a bigger truck and it was running great __________________ 67 SWB In Progress, one piece at a time, maybe 3 years I will be finished

11-23-2003, 03:47 PM	#11
68cajun 68 C/10 Join Date: Oct 2003 Location: Houma Louisiana Posts: 367	I know they are pretty dependable, and fairly efficient. I just wasn't sure about the horsepower i could get out of it. I don't want anything to wild just around 300 hp. I plan on using the truck as a weekend cruiser. I have been down the road of high horsepower with an 86 short bed, fleetside pushing around 450hp. It was fun, but expensive, and not all that reliable. I will continue to look for an TPI or MPI setup while i build the truck. But if i don't find one at a resonable price i think i will try the TBI. Thanks for the input. __________________ (2009) GMC Sierra Denali 6.2 AWD (67 C/10 fleetside SWB) (2018GMC Yukon Denali) Wifes Car

11-23-2003, 04:06 PM	#13
redbowtie Account Suspended Join Date: Nov 2003 Location: Fort Worth, Texas Posts: 0	If you didn't have a TBI motor already it would be much better ta start with an L98 TPI motor (Z's and Vettes, 86-92) you can pick them up fairly cheap, and they run great, tons of TQ....

11-23-2003, 07:13 PM	#14
68c10owner Registered User Join Date: Oct 2003 Location: Carmichael, California Posts: 3,011	the 96-99 truck vortec 5.7 makes 255hp. would`nt take much to get it to 300. my old `99 x-cab had a 5.0 vortec with 235 hp and it was very powerfull. great motors. __________________ Anthony

11-23-2003, 09:32 PM	#15
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	ive been wanting to know what those vortec engines made. 255 hp. thanks. thats what my moms sub has in it. __________________ 70 longbed 496/th400/Ford 9"

11-24-2003, 01:11 AM	#16
swdobbs Registered User Join Date: Oct 2002 Location: MT Posts: 98	'93 TBI in '70 I right in the middle of a '93 TBI motor swap, matched injectors ramp plate, headwork, still undecided on what cam, Byan Herters reprogram... and I bet I'm at a solid 265 hp and getting 16mpg before I've spent $1000 total (including motor). That is why I went with a TBI instead of an overpriced LT1 donor. The optispark on an LT1 and the shear agravation of changing plug wires and dealing with OBDII is for people with deep pockets, lofty goals and nothing but time. But I do love my DGGM '94 b-body in SS trim. Scott...



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11-24-2003, 02:15 AM	#17
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,892	I have run a couple of vortec headed small blocks on TBI! The first one was a stroked 350 with vortec heads it ran extremely strong but was pretty hard to get the bugs out of! It took a year to get it to run as well as the 240k 350 I took out. The second one was in a 95 suburban and it ran decent but the computer made it run rich and I couldn't find the problem. So I took it out of the sub and put a zz4 cam in it with a 650 dbbl pumper and it runs great. now! __________________ Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!

11-24-2003, 03:04 AM	#18
68cajun 68 C/10 Join Date: Oct 2003 Location: Houma Louisiana Posts: 367	ECM Location swdobbs : Where do you plan to mount the ECM? __________________ (2009) GMC Sierra Denali 6.2 AWD (67 C/10 fleetside SWB) (2018GMC Yukon Denali) Wifes Car

11-24-2003, 08:12 PM	#20
swdobbs Registered User Join Date: Oct 2002 Location: MT Posts: 98	PCM location I have a bracket to locate the PCM above the glove box enclosure. The CEL and data plug are hung next to the ignition. This time I'm using a "Painless kit" ---101. The radiator requires a inlet for the heater core return. Scott...

11-25-2003, 02:33 PM	#21
68cajun 68 C/10 Join Date: Oct 2003 Location: Houma Louisiana Posts: 367	ttt __________________ (2009) GMC Sierra Denali 6.2 AWD (67 C/10 fleetside SWB) (2018GMC Yukon Denali) Wifes Car

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