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383 with EFI?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by HarryH3, Aug 21, 2001.

  1. HarryH3

    HarryH3 1 ton status Author

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    I'm looking at engines to drop into the '90 Suburban that I recently bought. GM's new 383 looks like a sweet engine (though the price tag is a bit extreme). Their 330 HP 350 is also nice, with a much more reasonable price tag. [​IMG]

    Both of these engines come with Vortec heads installed. I know there's an intake available that will let me drop my stock TBI on top of either engine. However, has anyone seen a chip out there that will make the stock TBI work on either of these engines? I don't mind if it requires larger injectors and/or adjusting the fuel pressure to make it work. I just don't really want to mess with a custom chip burner. Most of the folks that I know that have used that type of service have ended up getting 3 to 5 chips custom burned before the engine really ran right.

    The final solution also has to pass the Colorado Front Range emissions test. [​IMG]

    Any ideas or other engine recommendations?

    Thanks!

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  2. Brian 89KBlazer

    Brian 89KBlazer 1/2 ton status

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    Harry

    First off; you're the one who's supposed to have the answers; not be asking the questions!!! [​IMG] [​IMG][​IMG]
    Secondly; the correspondence I had with GMGoodwrench via email told me that I would need a custom chip for the cam in the H.O. 350 for sure &amp; it may still not work! They weren't positive on the 383. I seemed to be talking to 2 different people! One was really helpful advising to try it first; then add only what you had to approach. The other gave me a more "corporate" line like "GM does not endorse the use of this product...." [​IMG]
    From Howell FI ; I was told to replace the chip &amp; the TBI unit while Turbo City only told me to replace only the TBI unit &amp; the pressure regulator!
    One person I think got it to work is a guy named Rich here on the board. Sorry I can' t be of more help.

    Brian
    89KBlazer

    Build it Right or Don't build it at all!!
     
  3. HarryH3

    HarryH3 1 ton status Author

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    Brian, I'm laughing right out loud! [​IMG] I know that it can be done, I just don't want to reinvent the wheel if someone else has already done it. [​IMG] I'd rather just plug and play since this one is going to be my new daily driver.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  4. Thunder

    Thunder 3/4 ton status

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    Check out these guys<a target="_blank" href=http://www.fastchip.com/>http://www.fastchip.com/</a>
    i'm running one of their stage 1 chips and it works good.
    They can burn almost anything and they specialise in only GM. They list a chip for the 383 on their custom chips page.
     
  5. solowookie

    solowookie 1/2 ton status

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    I'm getting a short block put in Jedi Mind Trick right now with vortec heads etc., and these are the guy's that did my customer chip. they seem really on the ball, and they were fantastic to work with.

    you might wanna give them a call with your question; they've burnt a LOT of customer chips, and have had good experience with some of this stuff!

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>http://coloradok5.com/gallery/Jeffs-Stuff</a>
     
  6. shawnboy

    shawnboy 1/2 ton status

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    Toronto, Canada, eh.
    I use a hypertech stage 2 chip and a 160 degree stat on my crate motor with the stock tbi and everything gets along quite well.
    Shawnboy.

    If you are having too much fun it's probably illegal.
     
  7. bigk

    bigk 1/2 ton status

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    Contact greenwoodchevy.com.

    Karl
    Temporarily Unemployed Underwear Model
    87 3/4 ton
     
  8. moneypit

    moneypit 1/2 ton status

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    Pro 4x4 did my 383 chip. And yes it is my 2nd one. Now it is very dialed in. He still has my info saved on his computer so maybe he can get yours done perfect the 1st time. BTW how is the K5 coming along??
     
  9. HarryH3

    HarryH3 1 ton status Author

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    Hi Toby, I was just wondering this afternoon if Jim over at Pro4x4 could help me out! I'll give him a call. I prefer to give business to locals and Jim's about as nice a guy as I've ever met. [​IMG]

    The K5 is on the back burner since I picked up the '90 Suburban. Want to get it road (and moderate trail) worthy ASAP. The 35's I bought from you are going to end up on the Sub now, along with the sweet Centerlines I bought from Randy (OneLeft) last weekend. [​IMG] I guess I'll have to keep an eye out for some 37-inch SSR's for the K5. [​IMG]

    I got a reply back from Ed at Fastchips.com. $350 plus shipping for the chip to run the HO 350. He said he hasn't yet made a chip for the new 383. But he also said that with TBI neither engine will make the power that it's rated at with a 4 barrel carb. [​IMG] It's still got to be WAY ballsier than a stock 350. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  10. Brian 89KBlazer

    Brian 89KBlazer 1/2 ton status

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    Two points for your comments:
    1. I'm with you on your last statement - "It's still got to be WAY ballsier than a stock 350. [​IMG]"
    2. "...he also said that with TBI neither engine will make the power that it's rated at..." Why wouldn't it??
    I know that "on-paper" calculations usually aren't exactly right in the real world BUT, according to GMGoodwrench &amp; Delphi Automotive (makers fo the stock TBI unit); it should flow between 450-500cfm. Using the formula:CFM = C.I.D. x RPM x V.E./3456 where V.E. is at best 0.8; a truck 383 at a max 5500 RPM shouldn't need much more than 488 CFM!! So why wouldn't the stock TBI let the 383 at least make "good" power; if not optimum?? Wouldn't too big of a CFM TBI be like overcarbing an engine??

    Just trying to get the creative juices flowing in the engine dept!! [​IMG][​IMG]

    Brian
    89KBlazer

    Build it Right or Don't build it at all!!
     
  11. moneypit

    moneypit 1/2 ton status

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    Wow that's an expensive chip. I know his price is nothing like that. Also you pay for one he will keep making them till he gets it to his satisfaction per the computer at no extra charge. BTW want to sell the K5???
     
  12. HarryH3

    HarryH3 1 ton status Author

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    Don't know the answer to that one Brian. Just passing along his comments. I'd think that at least the fuel delivery would be a bit more eveny distributed with a 4-bbl carb. Multi-port injection would cure that. [​IMG]

    Toby, I'll give Jim a call today and see what ideas he can come up with. [​IMG] As much as my wife would love to see the K5 leave the driveway, I've got too much blood, sweat and gears into it to sell it now. One day, when I don't have 500 other projects going on, I'll get it back on the road again. Seems I was much more motivated to keep up with it when it was my daily driver. Now that I've got other modes of transport, it gets neglected too often. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  13. Emmettology 101

    Emmettology 101 3/4 ton status

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    Hey, that place isn't far from me! We bought a couple vans off of them a few years back!

    Mike

    <font color=green>"It's like a sore dick deal, You cant beat it!"</font color=green>

    <a target="_blank" href=http://www.geocities.com/emmettology101>www.geocities.com/emmettology101</a>
     
  14. HarryH3

    HarryH3 1 ton status Author

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    I checked out their (Greenwood Chevy) website. Their crate engine prices appear to be $100-200 higher than Pace or Scoggin-Dickey. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  15. dawson444

    dawson444 1/2 ton status

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    How do I contact Pro 4x4? I want to get a chip from them. Money pit, what can yo tell me about your 383? Thanks!

    Dawson
    Raleigh, NC

    88 K5, 6" lift, 36" TSL Radials, 14 Bolt, Rancho 9012s
     
  16. HarryH3

    HarryH3 1 ton status Author

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    Pro 4x4 is at (303) 343-7672. Jim Provence is the owner. He's got a sweet Scout with an EFI Mopar 440 that's been bored and stroked to 500 cubic inches and makes ungodly power. Hell of a nice guy too! [​IMG]


    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  17. moneypit

    moneypit 1/2 ton status

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    I think my carb had more top end but who needs that when you are on the rocks??? TBI sure is nice. Runs great all the time awesome low end and mileage is a bit betteer, throttle response is wayyy better. The TBI unit has been maint. free so far just turn key and lets go wheelin!!
     

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