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'87 IROC 5.7l TPI or an '97 TBI 5.7l with Vortec heads?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by 72Blazerod, Nov 4, 2001.

  1. 72Blazerod

    72Blazerod 1/2 ton status

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    \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    Help me out here guys,

    I need to get a new engine for my '72 Blazer and I have a line on two. One in a 1987 5.7l IROC TPI with 85k miles. This one is missing its' MAF sensor.

    The other is a 1997 5.7L TBI with Vortec heads that has about 38k miles. Both are not too bad for price.

    Which would you choose? I really want to go fuel injection!


    Thanks for your help,

    Rod

    <a target="_blank" href=http://communities.msn.ca/72BlazerodsOldChevyTruckPage/photoalbums.msnw>http://communities.msn.ca/72BlazerodsOldChevyTruckPage/photoalbums.msnw</a>
     
  2. Tommy

    Tommy 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    I like the TPI, but those vortec engines are BAD ASS! If the price is close, definitely go with the vortec. Racers around here are taking them, putting a cam in them, a manifold and good carb, outrageous results.

    Drive it Like You Hate It!
     
  3. Chris Demartini

    Chris Demartini 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    <font color=blue>The 97 isnt TBI, its a Vortec multiport setup. It will be more work to install than a TPI.
     
  4. 72Blazerod

    72Blazerod 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    This is the stuff I need to know, thanks!

    Could you let me know why is the '97 engine more work? What sorts of things would have to be done differently?

    Thanks for the help,

    Rod

    <a target="_blank" href=http://communities.msn.ca/72BlazerodsOldChevyTruckPage/photoalbums.msnw>http://communities.msn.ca/72BlazerodsOldChevyTruckPage/photoalbums.msnw</a>
     
  5. DesertDueler

    DesertDueler 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    Alot more sensors. I would do the tune port and put a good set of aluminum heads if you are looking for power.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  6. therobzilla

    therobzilla 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    Go with the TPI, I did and I am very happy, I also had the chance to use a Vortec and opted for the TPI. Much more infor on the swap and much easier. More aftermarket stuff for the TPI and the TPI is the deal when it comes to torque.

    My opinion.
     
  7. BurbinOR

    BurbinOR 3/4 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    I would vote for TPI (big surprise [​IMG]). It will be easier to install and has lots of go-fast parts available. Love mine.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  8. 88streetblaze

    88streetblaze 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    i like the tpi personally i've got an 96 corvette lt-1 in mine and i love it, and if memory serves isn't the vortec a non sequential multi port, that is it has one injector that feeds all eight cylinders and the same time, insteed of one injector per cylinder?

    <font color=blue> If sancho knows what good for him, he best go run and hide. Cause daddy's got a new 45.</font color=blue>
     
  9. Triaged

    Triaged 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    MPI has 8 injectors

    Isn't sequential when it times the injection of each injector to the opening of that valve insted of batch firing them all at the same time?

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  10. Steve_Chin

    Steve_Chin 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    I don't know what's what here, but I know that there were some CPI (Central Port Injection) Vortec engines that used a single large injector. They're better controlled than the TBI setups, but still not quite as good as a batch-fire port injected setup and nowhere near as good as a true sequential port injected setup. If this Vortec is a CPI setup, I'd definitely go with the TPI even though it's missing its MAF sensor (easy to get, not too horribly expensive). If it's a true milti-port setup and the price is similar, I'd go with the Vortec. Of course, if you have a manual transmission, I'd go with the TPI engine either way because there aren't any good flywheels for the small register cranks on the Vortecs.
     
  11. 72Blazerod

    72Blazerod 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    My Bad! Sorry, I don't know where I came up with the TBI thing. But what does make the muti-port system harder to install. Is there any info out there about retro-fitting one of these newer Chevy engine into another vehicle? There is a guy on a web page close to my home (www.bc4x4.com) that said he just pulled one of these from a '97 and can't wait to put it into his J%#P. All the guys on that site are telling me to go for the newer engine. I know we have a few engineers here on this page, why would the newer engine pose such problems?


    Also, what fly wheel did the 5-speed trucks of '98 use? Would that work on my truck? (I do have a SM465).

    Thanks guys,

    Rod

    &lt;a target="_blank" href=http://communities.msn.ca/72BlazerodsOldChevyTruckPage/photoalbums.msnw&gt;http://communities.msn.ca/72BlazerodsOldChevyTruckPage/photoalbums.msnw&lt;/a&gt;<P ID="edit"><FONT class="small">Edited by 72Blazerod on 11/07/01 05:21 PM.</FONT></P>
     
  12. Steve_Chin

    Steve_Chin 1/2 ton status

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    Re: \'87 IROC 5.7l TPI or an \'97 TBI 5.7l with Vortec heads?

    The biggest difficulties in installing any of the newer model engines into an older vehicle revolve around packaging (where to put stuff) and execution (how to adapt things). The sensors and wiring really aren't all that bad in my mind. Where to put the ECM, relays, and some of the modules can be problematic in some cases (luckily, we have LOTS of room in the blazers!). I don't see where a '97 engine would be any harder to install than an '87 engine, other than the presence of a little more wiring and a couple of more sensors. In either case, you need to mount the ECM in a place where it's not going to get wet, vibrated to death, or bashed.

    FWIW, I used to work with a guy who put a new-ish F*rd 5.0 EFI engine into a J@@p (along with an NV4500). It was pretty sweet.

    Anyhow, the later trucks used an inertial-balance flywheel with the small register crank. The problem I see with it is that it only acceptsan 11" clutch. Not too big a deal to most, but since my Blazer originally came with a 12" clutch, that's what I want.
     

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