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Engine Selection

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by sickquad, Aug 7, 2003.

  1. sickquad

    sickquad 1/2 ton status

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    So, It is time for me to pick a motor. I have a 85 Blazer, running 33's. The truck will be a daily driver and I will be taking it offroad frequently. The wheeling we do around here is mostly trail riding. Where a limited slip and 33" mud terrains are necessary.

    My question is if anyone has any experience with the stock GMGoodwrench motor for my truck.
    These are my options:
    1971-1985 Lt Dty Trks 350 (LM1) New Goodwrench Engine # 10067353
    or
    1987-1993 Lt Dty Trks 350 (L05) New Goodwrench Engine # 12520270

    Does anyone know anything about these motors? Would they be considered weak replacements? Do you guys know the horsepower ratings? The local GM dealership doesn't know

    My other alternative is the 330 HP #12486041

    Thanks for any info you may have.

    Chris
     
  2. 75-K5

    75-K5 3/4 ton status

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    If you're gonna get a new engine, crate motors are the way to go. They have good power and I know of a couple that are getting ready to turn 100,000 miles. Plus, you can't beat the warranty. I'd say go for it.
     
  3. sickquad

    sickquad 1/2 ton status

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    If anyone has experience with these motors I would love the input. I'm new to the full size chevy world. Convert from the jeep world.
     
  4. RockyRider13

    RockyRider13 1/2 ton status

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    I'd go with the newer engine. One piece rear main seal, and set up for roller lifters.
     
  5. BowtieRed

    BowtieRed 1/2 ton status Author

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    the universal 350, the cheap goodwrench one, is about $1200, and produces 260hp, 350 ft. lbs. I have it, I think it's underrated- when I had my 12b with 4.88s and a posi- it would EASLIY turn both over through 2nd on dry pavement.

    It'll still turn one over with my 3.73s and no posi.
     
  6. crazykev4x4

    crazykev4x4 1/2 ton status

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    the LO5 is the tbi engine 210@ 4000rpm is what they put out . im doing an engine swap right now in my 88K5 im installing a vortec 350 froma 96 and up pickup it is a L31 . roller cam and stuff vortec 350 from the factory is 255 horse and with aluminum intake headers and dual exhaust the numbers would probly be around 300 horse or so . im gonna run my TBI on mine
     
  7. alf4444

    alf4444 1/2 ton status

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    [ QUOTE ]
    the universal 350, the cheap goodwrench one, is about $1200, and produces 260hp, 350 ft. lbs. I have it, I think it's underrated- when I had my 12b with 4.88s and a posi- it would EASLIY turn both over through 2nd on dry pavement.


    It'll still turn one over with my 3.73s and no posi.



    [/ QUOTE ]
    I agree I just put one in and i think you should be able to build it up to put out more hp than the 330 hp ho for less money.
     
  8. Blue85

    Blue85 Troll Premium Member

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    I have the Goodwrench motor too. I like it. With just headers, dual exhaust some timing work and a new air intake, I am 100hp over stock (original engine was 305)
     
  9. Blue85

    Blue85 Troll Premium Member

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    Here's an aticle from CHP where they get about 300hp from it with just headers, intake and cam. Goodwrench Quest
     
  10. Z3PR

    Z3PR Banned

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    Get the 383-HT strait from your local GM dealership. You'll be happy with the extra torque of the 383-HT.
     
  11. loudnowlouder

    loudnowlouder 1/2 ton status

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    i spent the cash on a 330hp 350HO about 2 years ago...the engine itself runs great, HUGE improvement over the 305 running on 6 cyl....
    but i had several problems with seals leaking...first to go was the rear main, then the intake seal went south...
    they only have a parts warranty, so its pretty much useless for things like this, the seals arent that expensive, but i spent a ton of time swapping out seals on a motor that had less than 2000 miles on it...
    other than that i cant say a bad word about the engine, plenty of power, sounds great, turned it into a new truck until the rust took over!

    my only advise would be to stay away from the deluxe version, it came with a holley 4160, which really has no business going off road, your'e better off buying the right carb and a low rise intake, the high rise is great on road, but the power is a little too high for me when off roading...

    good luck!
     
  12. crroy71

    crroy71 Registered Member

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    [ QUOTE ]
    Get the 383-HT strait from your local GM dealership. You'll be happy with the extra torque of the 383-HT.

    [/ QUOTE ]

    I have to agree.

    HP is good, but torq is king when it comes down to getting these monsters going.

    I am in the process of building a 390hp 457ft/lbs 383 right now.
     
  13. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    The 87' to 93 motor will probably need a different flex plate for the 1 piece RMS. Why not build a motor? How about a pumped up 406! /forums/images/graemlins/thumb.gif

    85K5 3/4ton,14boltFF,10bolt,9"lift,35"boggers,16.5x14 welds, 406 SBC/700r4 /forums/images/graemlins/k5.gif /forums/images/graemlins/angryfire.gif
     
  14. sickquad

    sickquad 1/2 ton status

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    Thanks guys, good info. I'm going to buy a goodwrench motor. With a good intake and headers it will produce all the power I need, for now. We mostly trail ride around here, traction is usually more important than power. Plus traction is cheaper than power.
    Chris
     
  15. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    The 87' to 93 motor will probably need a different flex plate for the 1 piece RMS.

    [/ QUOTE ]

    '86 and later are already 1 piece RMS.
     
  16. txbartman

    txbartman 1/2 ton status

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    I think you made a good choice. The basic GM 2350 is a good, solid, reliable motor with little or no mods. I started with this motor 2 years ago. For me, it wasn't quite enough. I dumped about $500 or so in it on internals (cam, lifters, springs, rockers, etc) and got it up to around 320 HP. Coming from a 305 motor with 170k miles on it that ORIGINALLY only produced 160HP OEM, it was a huge improvement. I have also since taken the same motor and bumped it up to 420+ HP by converting it to a solid 383. By getting a new GM crate, the block will be thick enough (and not sleeved) that you can do this too in the future if you decide you need more low end grunt.

    Key here is you will be starting with a solid, reliable, bolt-in and go motor. You will have the core of what it takes to build just about anything you want, constrained more by your pocketbook that the engines limitations.

    Have fun!
     

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