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More questions on GM Crate motors

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by lehtola, May 29, 2001.

  1. lehtola

    lehtola 1/2 ton status

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    This question is primarily for you motor heads out there and anyone else who has knowledge on the subject. Here is my dilema. In the near future I am going to need my engine rebuilt or replaced. My thoughts are that I will replace my current stocker 210 HP with a higher (much higher) performing GM crate motor. Hopefully the 383 HT when it is suppose to debut in July. If it never comes out then the 350/330 HP will do. In either case I will need to get a new intake manifold to accomodate the TBI or if I plan on getting a different fuel injection system (perhaps edelbrocks MPFI). We've all been down the road of the emissions issues. I'm not concerned about passing a visual but am with the sniff test. I will need to get a different computer chip to get my fuel curve where it needs to be but who can I go for that? Is anyone out there that has a similar set up or that has done the homework on this or am I on my own to do my own homework? I'm hoping I can get this question answered without wasting too much $$$. I know some of you have put on TPI systems. Anyone out there running a high performance GM or other crate motor with your TBI? If so...how is it working for you? Sorry for the long post.

    1990 GMC Jimmy 350/TH700R4/NP241/10 bolts, 4" skyjacker lift, 35x12.50R15 BFG All Terrains on 15x10 AR Baja's, Flowmasters.
     
  2. BurbinOR

    BurbinOR 3/4 ton status

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    I live in Oregon (emissions testing only and not visual) and did the TPI swap onto a completely built 406. No, it is not a 600HP race motor, but is a respectable 400+HP motor that has excellent street manners and has loads of uumph (spellling?[​IMG]) when you stomp on it. It passed emissions with flying colors to the point that the tech thought his equipment was screwed up. It has a custom chip engineered for a 454 (basically the fuel mapping for a 454) with late model LT-1 heads (roller rockers, etc), 10 to 1 compression, 24lb/hr injectors, 52mm throttle body, adjustable fuel pressure regulator, blah, blah. My point is, this is a motor that is far from stock and runs very dependably with great power..........and I did get 15mpg on a tank of gas when I actually checked.

    With today's technology, and finding the right people (key point) you can make a FI motor run like a bat out of heck, with good clean emissions. Best of all worlds.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<A target="_blank" HREF=http://www.blazzinor.coloradok5.com>http://www.blazzinor.coloradok5.com</A>
     
  3. Thunder

    Thunder 3/4 ton status

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    Try these guys:<A target="_blank" HREF=http://www.fastchip.com/>http://www.fastchip.com/</A>
    They specialise in custom chips for GM. I'm running one of their stage1 chips and it works real good. I'm sure they can build any chip you need.
     
  4. Cavalry

    Cavalry 1/2 ton status

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    You are going to run into some problems if you use a new crate.....To my knoledge there is no TPI intake for Vortec heads. I have heard there is a TBI intake in the works. This leaves you with a 4bbl intake and a adapter. I am no guru when it comes to EFI. But here are 2 thoughts..if you put in the original program chip for emissions testing wont your engine try to run at its best emiss efficiency( at a loss of performance)...#2 run a hotter chip so you are completelty burning the fuel and you have less emiss. Contact realsquash...he's really into EFI

    "There is a fine line between hobby and mental illness"
    Luke
    84 K5
     
  5. lehtola

    lehtola 1/2 ton status

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    There is a TBI intake for the vortec heads. Edelbrock makes it for GM. I guess my main question is...Is anyone out there running a High Performance engine in their blazer/jimmy? If so, how did you get it to run etc. By the way...the link to fast chip and super chip...thanks. Those folks say they can help out. Any testimonials out there?

    1990 GMC Jimmy 350/TH700R4/NP241/10 bolts, 4" skyjacker lift, 35x12.50R15 BFG All Terrains on 15x10 AR Baja's, Flowmasters.
     
  6. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    Dillon Colorado, Hang'in in the mountains. Renting
    I have the 350HO and no inspections. I searched for intakes all over for the TBI but the only thing I could find was a full injection system for over a grand. They also only have 2 intakes availible, 1 from Chevy and the Edelbrock Performer I got (both for 4 barrels). I like carbs so I didn't care. Some guys told me I could drill out the holes on a reg. intake to make it fit but I hate leaks, so I didn't. As for passing emissions, I don't know if they would for sure. Maybe someone out there has bolted a different set of heads on one to stay with the TBI. I love my motor but good luck, research it 1st.

    [​IMG]<font color=red>[/b]"Rid'in HigH in my K5"[​IMG]
    ....[​IMG]<font color=blue>[/b]"6" Lift -<font color=purple>38.5's"[​IMG]....
     
  7. ftn96

    ftn96 1/2 ton status

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    Ok, bro here is what I know. With the stock TBI injectors and the 350 HO motor, you engine aint gonna be able to get enoough fuel. If you keep the TBI, your gonna have to get the chip and some bigger injectors. I dont recall the HO motor having vortecs, but if you all are talking about it, Im assuming it does. I have a bad memory retention problem. LOL!! We wont go into that now.
    Anyhow, With you have a 90 model, and probably over 100,000 miles, the emissions people allow you to have higher levels. If you get the HO motor, get the appropriate carb for proper fuel delivery and be done with it. Im not exactly sure how all your computer stuff is going to hook up. You may just want to disconnect it all together, however, then you've got the ECM controlled 700R4, so then you've got rigging there.
    If you have a new motor and it is tuned up right and running good, you shouldn't have any problems passing the snif check. At the very most, you'll have to do a once a year temp fix to pass.
    If you have the money and want to avoid hassels. I would get the HO motor with the TBI/vortec intake manifold, get new chip and bigger TBI injectors and be done.

    My president is Steve Fox.
    90-350TBI-TCI700-241-33"-10 bolts w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  8. lehtola

    lehtola 1/2 ton status

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    who sells the bigger injectors? I know that gm makes the inatake with fit for the stock TBI. I'm wondering if I did that and got a spacer for the TBI and larger injectors with the new chip for my fuel curve if it would achieve what I'm looking for. Keep in mind I don't want a hot rod...just a quick and strong truck.

    1990 GMC Jimmy 350/TH700R4/NP241/10 bolts, 4" skyjacker lift, 35x12.50R15 BFG All Terrains on 15x10 AR Baja's, Flowmasters.
     
  9. ftn96

    ftn96 1/2 ton status

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    "paw" would have them Im sure.
    http://www.nashvillek5.freeservers.com
     
  10. mattman

    mattman 1/2 ton status

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    For larger injectors, try Turbo city. In fact, they can alter your TBI so that it can supply a 383 (just don't know about the 383HT). Think their web address is turbocity.com or turbo-city.com.

    90 GMC Jimmy, 350 TBI, 700R4, 32's
    84 Bronco II 204,000 miles and counting...........that's 206,000 and counting now
     

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