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Vortec Heads...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by fortcollinsram, Feb 21, 2002.

  1. fortcollinsram

    fortcollinsram 1/2 ton status

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    I have been contemplating putting Vortec heads on my 350 TBI...I vaguely remember somebody saying that I can buy the heads that have been drilled to work with MY CURRENT INTAKE manifold from someone like SDPC? Is this true...How much to I increase my risk of a leak if I go this route? Should I just spring the $300 for the GM performance intake while i'm at it and be done with it... Thanks for the help...

    Chris

    Was that a speed bump? No, just a Rice Rocket </font color=red> <a target="_blank" href=http://coloradok5.com/gallery/fortcollinsram>My 87 Blazer</a>
     
  2. CaptCrunch

    CaptCrunch 1/2 ton status

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    Risk of leakage is VERY HIGH!!! This process was developed by smaller time circle track runners. I know a couple guys who have gone this route and they have had a heck of trial and error process just trying to get them to seal for a race... forget daily driver stress and temp changes.

    If you want vortecs... just shell out for the TBI/vortec intake they have or you can run a vortec style carb intake with an adapter plate. If you like the current setup for heads them look into GM's HP model heads for the TBI and TPI vehicles. Same style heads as on your TBI truck, but more power. Also some large valved and worked Camel Hump heads flow pretty darn good and actually beat the piss outta the vortec heads in the higher rpms, you do loose some flow on the lower end and the benifit of the fastburn style cumbustion chamber. Most 2.02/1.60 Camels can be found in a local trader or Ebay for 300-400 bucks. Dart iron eagles and World products Torquer SR's are also awsome, but affordable cast heads. Both cost in the same ball park as the vortecs, with more valve and port options to fit you motor type and performance. All of these are a little less hassle in switching. You'd still need a manifold change, but those manifolds are also cheaper then the vortec style ones. Take a look around and evaluate your options. Vortecs are great for a 300 hp or so 350, but I would go bigger valves and ports for something like a 377,383, or 400,406 motor selection.

    Also don't forget to look into some of the extras with the vortech heads if you want to run a larger cam, need an EGR valve for emissions, etc. Also remeber that your TBI unit and ecm will really hinder you cam selection and power if you don't change/modify them.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  3. fortcollinsram

    fortcollinsram 1/2 ton status

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    Ya, I will probably get the Vortec's with the TBI/Vortec intake and then might get the Hi Flow TBI from TurboCity and roller cam and a custom chip...should gain a little HP and TQ...How do you like my route around changing my Valve stem seals? to lazy to do it so I upgrade...
    Thanks

    Chris

    Was that a speed bump? No, just a Rice Rocket </font color=red> <a target="_blank" href=http://coloradok5.com/gallery/fortcollinsram>My 87 Blazer</a>
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I'd replace the valve stem seals and add some 1.6:1 roller tipped rockers and call it a day. The stock heads aren't that bad...

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
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  5. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Yeah, mill 'em down to 67cc, do some pocket porting, drop in 1.6/2.02 valves, then add the roller tips, and call it a day, haha. I'm swapping vortecs on my 350 for my short box, I'm spending my spring break puttin that motor in (make tool man grunt) .

    Anyway, world castings makes heads that will bolt right up to your intake. I like how the vortec heads bolt to the intake, eight bolts that go straight down. They are really easy to get to.

    <a target="_blank" href=http://www.geocities.com/bigkern76>The Blazer Boy Page</a>
     
  6. Dunc03

    Dunc03 1/2 ton status

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    The vortec heads are a good buy, for stock heads. The flow 20 more cfm, 230 compared to 210 from older model chevy heads. This increase in cfm flows is good for an increase of about 40HP at the max horsepower rpm level. Not a bad horsepower increase for the money
     
  7. CaptCrunch

    CaptCrunch 1/2 ton status

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    Hahaa... you almost have me beat. My valve seals leak so I'm replacing the entire motor [​IMG] [​IMG] #1 no way the stock heads are worth shelling money into to be cleaned up or worked, and two there is no way in heck you are gonna see me doing the valve seals on the truck with a 6" lift. Lastly there is no way I'm gonna swap heads on a motor w/ 100k on it. That is just asking for mega problems IMO.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     

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