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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: johndeeregreg4 on November 01, 2019, 01:51:45 PM

Title: Tbi or not
Post by: johndeeregreg4 on November 01, 2019, 01:51:45 PM
[IMG]https://uploads.tapatalk-cdn.com/20191101/1eb4e67ff7f7e56fb80d52512be84b50.
Trying to get some clarification on the type of 350 I have in my K10. Bought this truck about a year ago and do not know what this engine came out of as itís a swap done 2 owners ago.
Thanks!
-Greg L.
Title: Re: Tbi or not
Post by: bd on November 01, 2019, 02:11:35 PM
What are you attempting to link?  Images can be attached using the "Attachments and other options" line located below the text window while posting.

What year is the vehicle?
Title: Re: Tbi or not
Post by: johndeeregreg4 on November 01, 2019, 02:26:07 PM
Iím trying to post a picture of the engine sorry I thought it worked the first time!


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Title: Re: Tbi or not
Post by: johndeeregreg4 on November 01, 2019, 02:27:04 PM
What are some things I should look for to distinguish a tbi vs non tbi 350?


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Title: Re: Tbi or not
Post by: Irish_Alley on November 01, 2019, 08:07:20 PM
a tbi unit will be on top of the engine.... but the center bolt valve covers are usually a giveaway
Title: Re: Tbi or not
Post by: Stewart G Griffin on November 04, 2019, 09:10:25 AM
What are some things I should look for to distinguish a tbi vs non tbi 350?


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What type of fuel pump you got?    And where is it located?
Title: Re: Tbi or not
Post by: SlayTank on November 17, 2019, 09:50:28 PM
From what I looked around at states The TBI heads have the center bolts for the valve covers and the two center bolts on ether side of the intake go in at a different (more straight up and down) angle. Those look like TBI heads and thus TBI intake. It could be a carb on top if someone swapped it out.


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Title: Re: Tbi or not
Post by: 75gmck25 on November 18, 2019, 05:51:28 AM
Based on the centerbolt valve covers, it appears to have TBI heads.  However, based on the linkage visible, it also appears to have a carburetor.

TBI (throttle body fuel injection)
- 87-94 TBI heads with center bolt valve covers (uses TBI intake manifold)
- throttle body mounted in the center of the intake manifold (not a carburetor)
- in-tank electric fuel pump
- computer and sensors to run TBI

Carburetor
-  55-86 style cylinder heads (old intake manifold bolt pattern)
- perimeter valve cover bolts (bolts down the edge of the valve covers)
- 4 barrel carb mounted in the center of the intake manifold. Stock was a Quadrajet, but Edelbrock and Holley are often installed.
- Mechanical fuel pump mounted on passenger side, lower front of engine block.  Metal line running up to carburetor
- No computer

Bruce
Title: Re: Tbi or not
Post by: Shifty on November 18, 2019, 09:08:48 AM
I've seen it an awful lot where people didn't fix a TBI problem, and ended up just changing out the intake and putting a carb on instead.   Heck, I've even see hillbillys replace the electronic distributor for points simply because they just didn't trust them dancy 'lectronics.... :o
Title: Re: Tbi or not
Post by: Irish_Alley on November 18, 2019, 01:26:32 PM
you can make a carb intake fit the tbi heads and theres prob a intake you can buy for the carb to go to tbi heads.