TBI Mod for better throttle response. 

I won't ever sell my 90 C1500 ext cab with the 350 tbi, it was my first Chevy truck, I grew up in a Ford family and they always hated my obsession with these trucks, GMT 400 will always be my go to for a reliable and easy truck to work on.

I'm about to do a throttle body rebuild on my 95 C1500. Drove it in high school 20 years ago and now working on restoring it. Excited to get started, thanks for the vids

I like the transition through the tools to get it removed, it reminds me of the meme that starts with a wrench and ends with the torch. “Please come off--I’m not asking anymore!” Lol I will be doing this mod to my 5.7 before putting it in the ole 93.

Bringing back memories from my 94 OBS👍was worth it

best mod to start with on any TBI 305 or 350 is to start in the fuel tank and work your way up ... order a 96 vortec 350 fuel pump , Ac Delco brand ( Reason is the fuel pressure falls Immensely off of idle and is barely enough to keep a Stock engine happy , which with mods it will instantly become to lean to keep it from running right or noticing any difference in Acceleration over the pinging ...... comes with screen and is direct fit + Quality OEM ... then go to the Adjustable Fuel Pressure Regulator and rebuild the TBI , clean it good ... Don't Upgrade the Injectors unless you do a Rebuild and a Cam/heads ... you won't be able to burn all of that fuel and it'll kill the engine instantly , plus it helps to get the Computer Flashed to handle the mods ... doesn't cost much and theres a limit to the Cam you can go / compression etc... thats under 1500 to do all of that listed ... sticking to the stock stroke is best for a stock TBI-Computer ran engine unless you want to go aftermarket... stock heads suck and not worth the time/effort/money on porting/working them over...

I raised mine 1 inch and the actual TBs about 1/4 inch. It was a kit. What also helped was an aftermarket air cleaner, open 360. I had to buy the one that hangs lower on the engine ( forgot the name) because now the hood hit the stock air cleaner! Also adjusted the idle up just a little. It is only a V-6 but it now "goes fast" on the ramps and likes doing 85. I did not cut off that lip.

real good video my brother...

I have done this 3 times. All 3 times I also put in new fuel pressure regulator springs and injector screens. Also installed the screw style adjustable pressure regulators. Could not tell what I did different from one to the other. But the first and third I could tell no difference in performance. The second time holy crap it made a big difference and sold it with the truck it was on. The second one is why I made the third. The guy that bought the truck with it on paid me to build him one for a friends truck but like I said it did not seem to make a difference. There was just some sort of unknown magic I did to the second one even when you transferred it from truck to truck it worked. I had a couple people ask me to do it again but I told them I do not know why the second one was so good and could not guarantee results so they did not have me do it.

I like the way you think! I have the same salad bowl and stock air cleaner set up, with a 4” duct for the cold air from the fender. I just found out this set up costs over 10 HP! I ordered a flat base 14” open element set up with a dominator size bore, to set on top of my salad bowl. I like a bit of induction sound. I agree, keep it simple. My 89 Silverado is a joy to work on. Nice attention to detail on your truck! Super clean never goes out of style.

I really like your product value bro keep up the good work

Where did you get the thicker gasket

Nice… did it make a difference? I’m thinking of doing mine. Is the best method to just use a grinder to get the imprints down?

Ditch the stock heads and put a set of non swirl heads on it. Had an 89 TBI 350 with a junk set of 882 heads and that made a huge improvement.

Wow!! Thats cool thanks

love your music u got in the back ground of your video..........

I used a spacer the injectors sit higher but did not shave the metal around the injectors, I do not believe that would help, did anyone do a dyno to prove added horsepower?

Did you have a stock tbi pump in it?

I wonder if this mod would work for a tbi 4.3, I know slicing the backs of the butterflies helps, but I could do this while i'm at it

I'm not convinced this is going to do anything without a cam and intake. Everyone says TBI heads are the worst thing on the planet. But After all of my modifications I can stay side by side with my dad's 85 vet until about 70. That's when I have to switch from third to Fourth. We haven't got to race since I put in a Dana 80 but I can tell you that b**** is heavy and slow the truck down a lot. The Chevy 8.5 is just junk. I started off twisting the axle shafts. Then stacked the 454 clutch I was running and had to go to a heavy duty six puck. Then I twisted the drive shaft like a toothpick. Now I'm running a f450 rear end with its drive shaft. I'm about to do the solid axle swap on it. With airbags up front. My engine is far from factory. Fully balanced and blueprinted 388. She's due for a rebuild so it'll be a 392 and I'm going to shorten up the cam LSA a little bit and go from a 114 to a 112. And you cannot push those heads past .56 lift without modification. I broke every damn valve spring in that b****. But when I was still running the throttle body she would pull past 6500 no problem. And my Cam's not even that radical it's 218 224. I can tell you drivability is hurt. But I would rather have the power if you just stomp on the throttle she'll fall flat on her face and backfire. You have to roll into it. Doesn't matter if I'm running TBI or carburetor. I'm about to put my TBI back on due to 93 octane being a million dollars and with the throttle body I can run e85 no problem the carburetor doesn't seem to like it.

What did grade did you use to sand it down ?

Like the info keep it simple

What’s the music and where did you get it

Got a 95 short wide the 4.3 threw a rod 345k on it. Got a 305 from a buddy at work it’s gonna be my DD was looking for little things I can do Just gonna keep it simple interior needs attention Got shorty headers Borla pro x gonna do 2 inch drop on the back only and enjoy

Is the transition supposed to be more rounded (radiused)? Like how they put round clay around intake ports when they flow test them?

Just a thought, but, if you have the availability, or a local machine shop, I'd use a vertical milling machine to do the "cutting" work......first, everything will be totally dead even in height and the finish, with a bottom cutting end mill, wouldn't require any sanding or surfacing. Also guarantees your air flow to be dead even...

I got a 92 mobile i change air flow and 02 but some time i give it the gas truck have 2 catch up

How about cut the center section of the tbi and install a OVAL throttle plate similar set up to the tpi throttle body when it got replaced with a 1000cfm oval throttle plate which is now standard on all throttle bodies with around 400 hp and up😎

Looks to me that the injectors would over spray the throat of the carb and fuel would run on to the intake manifold and be a fire hazard

did you up grade your fuel pump and pressure regulator spring

So it gives better throttle response?

Do you have any dyno or facts proving improvement?

Has anyone else done this dose it help

i got a 1990 k5 blazer i rebuild the engine bored my block 30 over

What causes a jerking,surg, hesitation at low speed ?(35mph to 45-50mpg) I thought it was the transmission but transmission shop said it was good. It's like the engine isn't advancing and trans not holding a down shift. I just can't find the cause. I've replaced to much to list and not enough to have found the problem. Any suggestions?

Did you notice any difference?

Did you say used a different gasket? Where did you get it ? Part # plz , great video !

Wouldn't the throttle body spacer do the same thing without having to cut up your throttle body?

Do you run the truck with the top flip?

On mine those flanges locate the air cleaner. Not sure shaving of those ribs helps air flow at all with the stock air cleaner spacer. Hmmm. I do like the injector spacer though.

Did this now my truck is idling rough and shutting off completely help any ideas

Ita been in my experience that any mod to the TBI will require upgrade to the ECU to function properly. The stock self learning ECU has a certain parameters that must be met, above or below any of the parameters causes the vehicle to not function properly.

So did it work ? was it worth all the hassle ? looked for a update on the mod and you have not said anything about it..............

Ok man, what's with the bearing of teeth while underhood? Is it like Jordan's tongue or something?

What kind of grinding disk to get more air flow into your tbi

Glad to see you're trying little tricks to continue to destroy LS motors, haha. Pretty cool man, never heard of TBI porting.

If you get the ppv or "police special" injectors you get more fuel to

I have a 94 suburban Silverado edition TBI it it idles low when warm NO check engine light what do you think it could be timing??? Never never stalled out before shakes a little bit at idle

My only question would have to be... Can you tell a difference?

Silly question but does the spacer help? Actual HP or seat of the pants HP?

negative ghost rider the pattern is full. Thanks for posting.

By chance do you remember how long this took to complete?

is that 350 injectors or 454

I have a 92 chevy 1500 single cab, long bed with a crate 350 bored 40 over. The motor runs strong but my transmission and rear end is over worked, I assume. I'm no mechanic, my uncle did the work before selling me the truck for $500.00. What's my next step?

Were u able to tell the difference?

I wonder if the 350 TBI and the 454 TBI are the same TBI....

Have you tried flipping over the air cleaner lid? Lot easier and probably more hp gain.

Always safer to remove TBI from engine first,,then take apart. Replace fuel inlet gaskets,& always torque inj. pod top screws to spec in. pds..,,,it will leak fuel if not done properly!!

Find out later what didnt work and what did work!!!

okay i thoought that was your music you put on there..

u'r face looks like you are in an extreme amount of pain unscrewing this TBI :D

Don't forget to smile more

i did that on my truck i did alot of up grades on my blazer.

Flip your air filter lid, gives it a much throater sound

اللهم صل وسلم وبارك على عبدك ورسولك محمدﷺ

I don't know what part of the country yawl live but here in the Denver, Colorado we have this thing called a Emission test . If your OBS Chevy doesn't have the emission equipment or the same engine or any other foolcanery smog stuff it came with from the year it was built it will fail emissions and you will not be able to register the vehicle. So with that being said, save your nickel's and drop in a HP Gm crate motor $$$$,, and turnkey and enjoy!..

Why did you left those sharp edges to the butterflies? It's good that you ground down the high spots, but air needs to curve in to the engine, not break a 90 degree. It needs to look like end of musical instrument. Trumpet, tuba, trombone, various horns, etc, expanding gradually and smoothly

Prob helps fuel economy too

This is some crystal meth mods to the max....lol

You seriously need to invest in a die grinder with a double cut carbide but, that'd get the job done like pronto, including grinding the venturi shafts down a little that'll let more flow through the TBI. You also need to ditch the stock breather and get at least a 14x3 inch open breather setup, a 14x4 inch would be better if you have the clearance. Also, a 2 inch soup bowl spacer between the TBI unit and breather would help in atomizing, along with the TBI spacer between the TBI and intake manifold.

I wouldnt let you in my shop

Time lapses the technical part that we actually want to see…then makes us watch him put the air cleaner on for 47 minutes. 🤦‍♂️

Not really gonna make a difference or a big one for sure. Might help a turbo set up breath a little better but idk about stock fr fr

how u gonna be that tweaked and not own a damn dremel tool....

Open breather is better...doin that to TBI doesn't make that much of a difference...

Lmao. How the hell is this going to increase horsepower? How does that reduce restriction? It doesn't enlarge the holes in the throttle or deshroud anything.

Tried watching but the music is SOOO annoying

Is this a dance party or a video about a truck wtf

Yooo u definitely have the gear head look but after watching 👀 u use tools maaaaaan stop