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i found a TBI 4.3vortec yes you read it right!

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  • i found a TBI 4.3vortec yes you read it right!

    didnt know they made them but i found one in a late 90s c1500. must heve been an export truck or something. i think it was a W/T
    sigpic
    69 C10
    http://www.fullsizechevy.com/showthr...y+project+pics

    72 C10 stepside RAT
    355/350/14bolt 3.73 posi

    92 k1500
    1/4 16.024 @ 84 MPH

    2006 ECSB 5.3
    1/4 15.588 @89.96 STOCK

  • #2
    Re: i found a TBI 4.3vortec yes you read it right!

    I thought all the TBI 4.3s had the Vortec heads?

    | 2006 LQ4 | 216/224 .561/.568 114 | 44lb. injectors | OBX LTs | Magnaflow Hi-Flow cats | 3" Borla XR1 | Yank TT3000 | FLT Level 5 4L65 | 3/6 drop |
    Track video:13.163 @ 100.08 | 1.793 60'

    Flickr

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    • #3
      Re: i found a TBI 4.3vortec yes you read it right!

      4.3's have been called "Vortec" since 1986.
      -Grant

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      • #4
        Re: i found a TBI 4.3vortec yes you read it right!



        yep, all the 4.3s were called Vortecs

        2004 GMC Sierra SLE Z71 rcsb, 5.3/4L60E/3.73/G80 time bomb...3" lift, tinted 03+ Silverado tails, plasti-dipped 16" wheels (unknown brand), 285/75/16 Thunderer M/T Extremes, Thrush Welded muffler...

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        • #5
          Re: i found a TBI 4.3vortec yes you read it right!

          some of the late model 4.3's came with the L35 (cpi) heads instead of the LB4 heads. the l35 heads flow better then the LB4 heads. i know in the s-10s gm also topped most of them with the plastic covers that say vortec on them
          -mark
          89 blazer 2dr 2wd L31 vortec 355|T56|8.5
          0411 pcm powered

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          • #6
            Re: i found a TBI 4.3vortec yes you read it right!

            My 91 c1500 has a vortec 4.3
            1991 C1500 2WD - Money Pit.
            1999 Silverado z71 - Cowl Hood - Flowmaster Duals - Debadged - 6000K HID's - '04 Tails - Daily

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            • #7
              Re: i found a TBI 4.3vortec yes you read it right!

              Originally posted by whitelightnin92
              didnt know they made them but i found one in a late 90s c1500. must heve been an export truck or something. i think it was a W/T
              As stated, the 4.3 has been called Vortec since the mid-80's.

              My dads last truck was a 1994 K1500 W/T with a TBI 4.3 and the valve covers both said Vortec on them. Its just the "brand" name of the engine, it has nothing to do with the heads/injection being Vortec heads etc.
              08 HHR LS - 2.2 | 5 speed | 30 MPG

              98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

              84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

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              • #8
                Re: i found a TBI 4.3vortec yes you read it right!

                Originally posted by tippmann243
                some of the late model 4.3's came with the L35 (cpi) heads instead of the LB4 heads. the l35 heads flow better then the LB4 heads. i know in the s-10s gm also topped most of them with the plastic covers that say vortec on them
                The CPI 4.3's were only offered from 92-95 on S10 Blazers and Astro vans(and their GMC equivalents).

                The CPI 4.3 looks like this:

                Last edited by 98GreenMachine; 05-04-2009, 01:37 AM.
                08 HHR LS - 2.2 | 5 speed | 30 MPG

                98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

                84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

                Comment


                • #9
                  Re: i found a TBI 4.3vortec yes you read it right!

                  So much miss information in this thread.

                  V6's have been called Vortec since the 80's but in 1992 they got L35 CPI HEADS but kept the TBI system.

                  Pre 1992 they were just 4.3Ls with the vortec name

                  1992-1995 CPI Vortec heads are used, they heads add something in the range of 5-10 horsepower and ARE a vortec head, just a early style one.(1992 was also first year for Balance shaft)

                  1996+ are "True" 90* intake bolt style heads and flow better the early CPI vortec heads.

                  So, any TBI truck in a fullsize truck that has Vortec Composite valve covers should have CPI heads that are early vortec heads.

                  Any with the centerbolt metal covers are TBI heads.

                  EDIT: fixed some of my wording it came out wrong.
                  Last edited by JoshTheCanadian; 05-04-2009, 01:49 AM.

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                  • #10
                    Re: i found a TBI 4.3vortec yes you read it right!

                    Originally posted by Orangette
                    So much miss information in this thread.

                    V6's have been called Vortec since 1992



                    1986, as mentioned earlier.
                    -Grant

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                    • #11
                      Re: i found a TBI 4.3vortec yes you read it right!

                      Originally posted by Orangette
                      So much miss information in this thread.

                      V6's have been called Vortec since 1992 when they got L35 CPI HEADS but kept the TBI system.
                      Wrong :read:

                      I'm too tired to correct the rest of your thread, I will do so later.
                      08 HHR LS - 2.2 | 5 speed | 30 MPG

                      98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

                      84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

                      Comment


                      • #12
                        Re: i found a TBI 4.3vortec yes you read it right!

                        I ment to say they have had vortec heads since 1992.

                        Here is a pic of my 1994 LB4, Z code engine that came FACTORY with L35 CPI heads.

                        Any truck with the plastic covers should have these heads and a balance shaft.
                        Notice the eyebrows on the ports.

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                        • #13
                          Re: i found a TBI 4.3vortec yes you read it right!

                          i gotta side with orangette here. vortec v6 heads were introduced on the cpi in 92, before then it was just a name, kinda like the cortec 305 in the late 80's. the vortec heads in fact flow better than regular tbi heads in 92-95 trucks. in 96 all v6's were vortec but were not tbi.

                          1994 yukon gt .........gone but not forgotten
                          1988 silverado RCLB 4wd........sold
                          1999 rcsb gmc sierra 1500, new toy

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                          • #14
                            Re: i found a TBI 4.3vortec yes you read it right!

                            Originally posted by Orangette
                            V6's have been called Vortec since the 80's but in 1992 they got L35 CPI HEADS but kept the TBI system.
                            Correction, in 92 Central Port Injection was introduced and a new head was designed for it. TBI and CPI was offered simultaneously on 4.3's up through 95. TBI's did not use CPI heads until 94, more info later on this.

                            Pre 1992 they were just 4.3Ls with the vortec name
                            correct

                            1992-1995 CPI Vortec heads are used, they heads add something in the range of 5-10 horsepower and ARE a vortec head, just a early style one.(1992 was also first year for Balance shaft)
                            I dont know where you pulled the 5-10 HP number out of but the CPI setup added ~35 HP & ~25 TQ over a TBI system in the same vehicle, same year.

                            1996+ are "True" 90* intake bolt style heads and flow better the early CPI vortec heads.
                            Correct, in 96 the true Vortec head was launched.

                            So, any TBI truck in a fullsize truck that has Vortec Composite valve covers should have CPI heads that are early vortec heads.
                            Your generalization is wrong here. From 92-93 the CPI and the TBI heads were different. The intake ports were different as were the valve angles. From 94-95 the TBI systems used the came head as the CPI systems. This is why your 94 heads pictured have the eyebrow on the intake port.

                            Any with the centerbolt metal covers are TBI heads.
                            I would suggest you take a long hard read over this article, it will clarify alot of your questions with actual facts:
                            http://forums.s-series.org/viewtopic.php?t=41520
                            08 HHR LS - 2.2 | 5 speed | 30 MPG

                            98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

                            84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

                            Comment


                            • #15
                              Re: i found a TBI 4.3vortec yes you read it right!

                              [QUOTE=98GreenMachine]The CPI 4.3's were only offered from 92-95 on S10 Blazers and Astro vans(and their GMC equivalents).

                              I would have to disagree with that statement. I had a 94 ex cab s-10 with CPI a few years back. I know that it was CPI because we liked to never found a replacement engine for it

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