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using vortec heads

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by fourwheelerjeff, Nov 17, 2001.

  1. fourwheelerjeff

    fourwheelerjeff 1/2 ton status Staff Member Moderator

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    I was wondering if anyone out there had any experience using vortec heads on an older engine. I bought a set from a rebuilder that was going out of business pretty cheap and was wondering about the performance. any opinions?

    it is always easier to ask for forgiveness than permission
     
  2. sosamantx

    sosamantx 1/2 ton status

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    supposed to be a major improvement, and flow better than some aftermarket heads. but, your gonna need a different intake manifold for the vortec heads, as they changed the bolt pattern for the intake manifold. see if this link works?? this is a dealer with a kickass message board.

    http://www.sallee-chevrolet.com/Discus/messages/10/1304.html?TuesdayNovember620011128am

    <font color=blue>Steve Sosa a.k.a. "sosaman"</font color=blue>
    <a target="_blank" href=http://sosaman.home.texas.net/carpics.html>http://sosaman.home.texas.net/carpics.html</a>
     
  3. fourwheelerjeff

    fourwheelerjeff 1/2 ton status Staff Member Moderator

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    you are right about using a new intake. edelbrock has a performer and performer rpm and i believe chevy performance has an intake as well, although jim pace chevrolet catalog has redrilled vortec heads but outt of my price range, don't know about scoggin-dickey but they would be closer to home, I was just going by what I have read in car craft ect.

    it is always easier to ask for forgiveness than permission
     
  4. sosamantx

    sosamantx 1/2 ton status

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    yes they do have the redrilled intake manifolds, but i've read (I think on Jim Pace site, as well as magazine), that they do not recommend them for the street. I think those are mostly for the race track (roundy round), that have to use stock intake manifolds, or something like that. Plus, they are expensive??

    <font color=blue>Steve Sosa a.k.a. "sosaman"</font color=blue>
    <a target="_blank" href=http://sosaman.home.texas.net/carpics.html>http://sosaman.home.texas.net/carpics.html</a>
     
  5. fourwheelerjeff

    fourwheelerjeff 1/2 ton status Staff Member Moderator

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    not redrilled intakes, redrilled heads so you can use any older intake and if I remember they were about 100 dollars more than nondrilled. I got mine for 200 for both with no core charge so I thought WOOOHOOO what a deal ( of course the guy went out of business, so I guess if I have problems it might not be a deal. oh well)

    it is always easier to ask for forgiveness than permission
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    Ok... here is a little rant of mine... Has any one used the redrilled set up on a daily driver vehicle????!!!??? If you have I'd like to here about it cause the circle track guy I know who runs them has leak problems. Most leak pretty bad and that is with ripping the motor down after every race.

    Ok... [​IMG] I'm done w/ my stern serious tyone now LOL. Well congrats on the heads. They are the best bang for the buck and best daily driver/low rpm head in the business. CHP recently only found them to be out flowed by the AFR 190 and the two Canfield heads in the mid range.

    The main issues that come up are #1 getting the Vortech intake style... it is a bit spendy but worth it. They now have offerings to bolt up carbs, TBI, and TPI. Edelbrock also is suppost to have a MPFI system being released for it soon from what is posted on their site. #2 usually is compression ratio. Some of the later models can have compression issues. I have seen then swapped on older motors no problem. It will depend on your current setup now. #3 is the valve springs... they are kinda weak and tend to bind up with agressive cams. That is the basics to start. Look around in the Chevy High Perfromance site and past issues at the library and you will find tons of info.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  7. chevyracing

    chevyracing 1/2 ton status

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    Why bother re-drilling them when a new manifold is only 179.95 at Summit? If you use the heads you need to make sure your cam is not too big too because of the springs won't take it that come on them. (I think 465 lift w/ stock springs) Also you need self aligning rockers ($50.00 @ Chevy dealer) and center bolt valve covers. You will also need special intake gaskets and <font color=red>DO NOT</font color=red> use the rubber gaskets in the front and rear or it will leak like Old Faithful. Use a 1/4 inch bead of RTV. Keep this in mind when you are ready to install them.

    John

    Like to go sloppin' 'round in da mud in a rapid fashion....=)

    <a target="_blank" href=http://coloradok5.com/gallery/albun31?&page=1>See my pics here</a>
     
  8. '73 K5

    '73 K5 1/2 ton status

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    Captcrunch knows what he's talking about and chevyracing sounds like he's describing my setup. He's right about all of it. BUT, even with all that said, when I put the Vortec's on my rebuilt older block, it made a huge power increase. Very noticeable.

    '73 K5
    Chevy good...Ford bad
     
  9. fourwheelerjeff

    fourwheelerjeff 1/2 ton status Staff Member Moderator

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    what i woould like to do is use the performer rpm and either a howell or holley "fool" injection system haven't given much thought to a cam. I tend to buy whenver i find a good deal and had some cams in storage but someone broke in and stole thecams and intakes and piston and lights, about the only thing they left was a new shop-vac. guess they already had one! some people really are lowlifes

    it is always easier to ask for forgiveness than permission
     

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