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Heat riser?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dyeager535, Jan 10, 2001.

  1. dyeager535

    dyeager535 1 ton status Premium Member

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    Anyone that knows what this is (little valve on passenger side, bolts between exhaust manifold and exhaust pipe) have any tricks to remove it? I will be keeping the manifolds, and have already bent the tabs on it so that it is wide open all the time, but I'd rather just replace it. I was wondering if any company actually makes a piece that fits in there but does not have the valve? I know I could pull it back out, cut the valve out, then plug the hole on the side, but I'd rather use a solid piece for a no worries seal. BTW, I already have dual exhaust, and I am going to be going to Vortec heads, so there is no heat crossover cast into them, so with it operational, I would be forcing that bank of cylinders to ingest almost all of its own exhaust...not a good thing I'm sure.

    Dorian
    My K5 and Chev/Olds links: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  2. Emmettology 101

    Emmettology 101 3/4 ton status

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    Take your K5 to an Exhuast shop and they should be able to remove it and lengthen you exhaust pipe to fit up..

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    Thanks for the suggestion, but its not possible, because the mounting flange, unlike the drivers side, is flat. That piece is required so that you can use a flat gasket, then the exhaust pipe mates up to that piece, which has the tapered flange cast into it. My friends started to rattle after he wired it open, I'm just trying to prevent that, and since I have the exhaust already unbolted on that side, figured I better check and see if there are any "adapters" out there for that.

    Dorian
    My K5 and Chev/Olds links: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  4. Emmettology 101

    Emmettology 101 3/4 ton status

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    Mine is loose also. We took a set of manifolds that had that riser on it and removed the riser and then had the exhaust shop make flanges for it.

    Have you tried taking it to a shop and see what they say?

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Nah, haven't tried that yet. The truck hasn't been inspected yet (no VIN, no plates!) so I don't know what year they are going to call it. If they call it older than about 1980, I can probably get a shop to make something like that. Unfortunately, around here, MOST shops won't even touch a vehicle that you want dual exhaust on. The fines are too much, and I guess it's not worth the risk for them. Plus I like doing stuff myself, the one thing I can't do is bend pipe. Not that I would necessarily have to, but unless its run by someone I know and trust, I wouldn't even let them put their hands on my vehicles.

    Dorian
    My K5 and Chev/Olds links: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    10-4 I know how ya feel....

    One thing you can do is maybe take the riser off and just take that to the exhaust shope and ask if they can make some sort of open spacer to fit in its place..

    Or you could take the riser off, and remove the butterfly completely. Then weld the hole closed(inside and out) where the rod for the butterfly came through and then re-install it.

    HTH

    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. DMK

    DMK 1/2 ton status

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    Most corvette catalogs carry a heat riser spacer for 2 inch manifolds. 57-65 corvettes with fuel injection use these. Think they are around 20-25 dollars. On my 69 corvette I just made the heat riser stick open.
     
  8. Gopherkiller

    Gopherkiller 1/2 ton status

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    Wire, or better yet, weld the thing open.
     
  9. scavenger

    scavenger 1/2 ton status

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    I would like to know how you can tell if the heat riser valve is open. On my 85 the the rod that opens and closes the valve was removed before I bought the truck and and I suspect there may be some restriction because the valve may not be all the way open. The prong that the rod attaches to is frozen in the 9 o'clock position facing the firewal. Any Ideas...thanksl
     
  10. Blazer79

    Blazer79 1/2 ton status

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    Why not just get a set of headers? You can find good sets from about $100. You'll gain some horsepower in the process too. I'm sure you'll also be able to find headers that are street legal.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    Great idea, thanks! My dad has a '68 Vette, and of course the catalogs, so I opened one up, sure enough, 2" spacer, 64-74 vettes, $20! Thanks!!

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  12. dyeager535

    dyeager535 1 ton status Premium Member

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    Too much hassle. The trucks have plenty of room, thats for sure. But DECENT headers (as in will last as long as manifolds) like Stainless or Ceramic coated, will cost you a minimum of $300. Then you have to have the exhaust modified. I already have factory true duals, in very good shape. Since this isn't a super high revving truck, the header benefit will be less noticed. I don't disagree, headers make a big difference though...I've actually almost been converted over to them...just not quite yet : )

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  13. talldogg

    talldogg 1/2 ton status

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    Dorian,
    What supplier are you looking at for the spacer? My frien'ds van (75 Chevy) is having problems with the heat riser as well, and $20 bucks sounds like a cheap fix. Thanks!

    It's not what you buy, it's what you build!
     
  14. dyeager535

    dyeager535 1 ton status Premium Member

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    http://www.riksvet.com/ thats the catalog that has both the 2" and 2.5" "spacers" as they call them. The 2" was $18 something. HTH

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     

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