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Engine suggestion?

Discussion in 'The Garage' started by BLKWOLF, Dec 30, 2002.

  1. BLKWOLF

    BLKWOLF Registered Member

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    What would you recommend for an engine upgrade for a full size '89 GMC Jimmy. I'm looking for a fuel injected engine with a balance of speed, power and gas milage. The truck will be my daily driver. Basically, I want an engine that can pass just about anyone on the highway yet not empty the gas tank. Is there a Crate engine you would recommend and with what options? My current TBI 350 c.i. engine gets 12 to 14 mpg. on 35" tires and stock gears.

    Thanks,

    Ray
     
  2. outlaw612

    outlaw612 1/2 ton status

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    12 to 14 MPG sounds low for a tbi 350. My father-in-laws tbi 454 gets that in a burb. Id say give your moto a good tune up and see if ya cant get those mpg #'s up.
     
  3. Z3PR

    Z3PR Banned

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    GM has a 383-HT crate motor. You could futher upgrade it with a TPI electronic fuel injection system. I really want one of those 383-HT crate motors myself.
     
  4. Sandman

    Sandman 3/4 ton status Author

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    A gear change might help. Lower gears might get the rpm's back into the power band and actually get you better mileage. More passing power also. Do you know what gears you have now?
     
  5. BLKWOLF

    BLKWOLF Registered Member

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    The gears are stock, which I think are something like 3:96. A friend of mine suggested upgrading my gears to 4:10 or 4:56. I might be getting better gas milage than 12 to 14, but that's just a guess based on the fact my speedometer hasn't been calibrated for my 35" tires, yet.
    Thanks,

    Ray
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Stock gears in an 89 would be either 3.42 or 3.73. Chev didn't have 3.96 gears. With 35's 4.10's or 4.56's would be better...

    Rene
     
  7. zakk

    zakk 1/2 ton status

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    with a 700R tranny i would go 4.56 to utilize OD.
     
  8. Thunder

    Thunder 3/4 ton status

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  9. fr8train

    fr8train 1/2 ton status

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    406 TPI like BlazzinOR had. I think he sold it but then again he might not have. Cant remember right now. /forums/images/graemlins/confused.gif
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    400=almost impossible to find
     
  11. fr8train

    fr8train 1/2 ton status

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    I can get you one. The yards here are sorta stocked with 400s and 425s.
     
  12. BLKWOLF

    BLKWOLF Registered Member

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    Someone once suggested I look for a multiport fuel injected motor, but I see most people suggesting TBI. They told me that TBI won't perform as well with upgrades such as cams, headers, micro-chips and new ehaust. Can anyone explain the difference between the 2? I'm pretty clueless when it comes to this stuff ;^) What's your opinion on the Ramjet engines or the LS1 crate engines?

    Thanks,

    Ray
     
  13. BLKWOLF

    BLKWOLF Registered Member

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    Thanks Renee, I think those gears are 3:73 ;^)
     
  14. Mreetz

    Mreetz 1/2 ton status

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    I've got a 400 block and new crankshaft for sale! Let me know if you decide to go that way. Marty---
     
  15. chevyracing

    chevyracing 1/2 ton status

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    I may be interested in the 400 and crankshaft, but I don't want to be a thread pirate. After he makes up his mind let me know......

    John
     
  16. Mreetz

    Mreetz 1/2 ton status

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    Will do! Its posted way back in the for sale column too.
     
  17. roostr3269

    roostr3269 1/2 ton status

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    I run a 502 Ram Jet in my '72 Jimmy. I get about 10 mpg, which aint all bad considering the numbers shes puttin out. If you want stump pullin power, go with the 350 rj, or go balls to the wall with a 502, hehe.
     
  18. BLKWOLF

    BLKWOLF Registered Member

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    John, go for it, if you want that engine. I'm not quite in the market yet, for a new engine, but wanted to know what everyone's opinion was here when I am ready.

    roostr3269, how is the R.J. 350's highway passing power? Could I expect about 14 to 16 mpg. with it? This truck is going to be mainly a pavement pounder occasionally going 4 wheeling. I want to turn it into a show truck.

    Thanks,

    Ray
     
  19. Mreetz

    Mreetz 1/2 ton status

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    Give me a call John, I'm sure we can work something out. I've got a '73 Camaro project goin here too! /forums/images/graemlins/k5.gif
     
  20. Thunder

    Thunder 3/4 ton status

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    TBI perfpoms great with upgrades. I have Edelbrock headers, exhaust, chip, fastchip.com improved K&N intake ect and I am generating plenty of power from a TBI. My blazer will go faster than I want it to. and I get 18 mpg at 70 mph going down the highway
    The main problem with stock TBI is air flow. The link to Turbocity in my other post will cure that. Talk to them they can fix you up with a very good system.
    You can get a chip burned for just about any cam you want too. But the stock chip will work with cams with up to 212 degrees duration and .480" or so of lift. You can pull a lot of torque out of a cam like that.
    Also an adjustable fuel pressure regulator is a must. So you can boost the pressure and fine tune the spray pattern.
    With your truck TBI is probabally the easiest and cheapest way to go.
    If you want to spend more money then go with MPFI
    Here's the link to Howell:howell-efi.com
    Edelbrock and Holley also sell MPFI kits.
    Check them out and you can compair the different systems and decide whats right for you.
    Personally I perfer TBI for a truck. Its rugged dependable and you can get parts fot the GM units anywhere.
     

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