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305 vs 350

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1st timer, Feb 2, 2001.

  1. 1st timer

    1st timer Registered Member

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    thinking of switching from 305 to 350 is there a big difference in power and gas milege
     
  2. Andreas

    Andreas 1/2 ton status

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    The 350 is better on everything while getting about the same milage. Way easier to find parts if you wanna build it a little too.

    Andreas

    406cui of pure sh*t[​IMG]
    <A target="_blank" HREF=http://hem.passagen.se/znus/>http://hem.passagen.se/znus/</A>
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    if it was me i would do it you will see and feal a big differance

    s.smith 77blazer lookin 4 mud [​IMG]
     
  4. moneypit

    moneypit 1/2 ton status

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    I went from a 305 to 383 what a difference!! I should have done it long ago!! Gas mileage is pretty close to the same but the HP's are double and so is the torque!! Don't even think about it JUST DO IT! You won't regret it. Good Luck!
     
  5. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    Location:
    Dillon Colorado, Hang'in in the mountains. Renting
    You will definately love a 350 or 383. The stock 87 305 only had 170 hp (lame!), my crap ranger has 145hp. If you want to stay stock, take the time to check out the hp on different years. even the stock 87 454 only had 240hp. If you are as crazy[​IMG] as me, you can get a brand new 350HO with 350hp from your friendly Chevy dealer for about $2,500 but the extras will get you $$ and you can't live where they test emissions. A good stock 350 should be easy on the wallet.
    OR JUST GO FRECKIN NUTS AND MAKE IT SCREAM!!!![​IMG]
    <font color=red>BLAZERS RULE....

    Here is my 350 just before completion.....

    [​IMG]
    [​IMG]<font color=red> Ride'in High In My K5! [​IMG]
     
  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    Yes, I would definately do it... You will have more HP with the 350...

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  7. 85k5blzr

    85k5blzr 1/2 ton status

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    Trust me, do it, i have an old 305 in my blazer.....let's just say i don't go anywhere fast. Get what we all would if we had the money......a Ram Jet 502....that's power.

    85 k5 blazer with an old 305....must have more power! [​IMG]
     
  8. Pugsley

    Pugsley 1/2 ton status

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    When I swapped my 305 for a 350, not only did the power improve dramatically, I got about 7-8 mpg better! Mine's the GM 350hp model, and it's by far the best $2465.83 I've ever spent.
     
  9. nyyef

    nyyef 1/2 ton status

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    you should have no doubts in your mind about this swap. to make it cheap, just throw in a stock 350, then build/modify as funds permit.

    Knife.
    knife.coloradok5.com
     
  10. NYC K5

    NYC K5 1/2 ton status

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    i went from the 305 to 350. i got it new from gm for $1500 but i had to reuse the intake and exhaust and accesories. for the power you have to do the conversion. i lost a few mpg i could max out the 305 at about 18mpg the 350 i get a best of 15mpg but the power difference is well worth it. also when you do the swap change the clutch(manual) the water pump throw a good set of headers on and rebuild the carb. youll appreciate that later on.
     

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