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Anybody using Sealant on Valve Covers?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1986Blazer, Oct 31, 2001.

  1. 1986Blazer

    1986Blazer 1/2 ton status

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    Is anybody using gasket sealant on their valve covers along with the cork gasket? I have always used a small bead but I was wondering if the gasket by itself is good enough.

    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  2. chevyracing

    chevyracing 1/2 ton status

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    Each particular case is dependent on the condition of the valve cover. I use sealant on mine after I am sure my valves are adjusted perfectly and I am sure I won't have to open them up for a while.

    John

    Like to go sloppin' 'round in da mud in a rapid fashion....=) [​IMG]

    <a target="_blank" href=http://community.webshots.com/user/chevyracing>http://community.webshots.com/user/chevyracing</a>
     
  3. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    If you do have to use it, use it sparingly (a little goes a long way). That being said, you should not have to use any. Over time the stock covers and tin aftermarket chrome ones can warp causing leaks even when using new gaskets. You can use a block of wood and a dead blow hammer to straighten them out. The best investment if you have a steel cover is to buy a complete set of load spreaders (wider is better), and use them along with a straight/straightened valve cover (less chance of warping). I myself like to use cast aluminum covers because of there thickness and rust resistance, but they generally cost much more. It's up to you depending on need and $$$, but I caution that using too much RTV can get into the oil passages and plug them or the pick-up. Everything in moderation.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot>http://coloradok5.com/gallery/Leadfoot</a>
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    Well if you are using a cork gasket you shouldn't use any sealant at all. RTV and cork is a bad combination as it makes the cork crack and can results in leaks. Your valve covers should be fine w/ just the cork gasket alone. If you are really concerned then goo buy some nice rubber or reuseable gaskets.

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

    xnoahx 1/2 ton status

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    When i was putting my cobers on i put a little between the gasket and the cover and none between the gasket and the head.

    My 73 K5 <a target="_blank" href=http://www.geocities.com/xk5blazerx/73k5.htm>http://www.geocities.com/xk5blazerx/73k5.htm</a> 350/TH350/NP203, Q-jet, Edelbrock intake, Vortec heads, 4" lift, and 36" TSL's
     
  6. fad2blk99

    fad2blk99 1/2 ton status

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    Like one of the other guys already said, don't use it if you don't have to. You are really not supposed to use sealent and gaskets together at all (there are a few exceptions).

    <font color=black> -Tommy
    <font color=red>"To secure peace is to prepare for war..."
     
  7. newyorkin

    newyorkin 1 ton status

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    I'd do what CaptCrunch said, buy a rubber one.

    I've used RTV on cork in the past. What I've also found good for cork, is a thin bead or grease on each side, so when tightening it, it spreads out smoothly without pinching.

    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    Welcome to America.
     
  8. 90K5

    90K5 1/2 ton status

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    I used some spray on stuff made by Permatex, sprayed down the whole gasket on both sides, and stuck them in there...haven't leaked yet.

    90K5
     
  9. 1bad82k5

    1bad82k5 1/2 ton status

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    I use just enough to stick the gaskets to the valve covers, and none on the heads. I have gone with or without it. I don't use it on the heads, because it seems that i always end up pulling the valve covers frequently. I use rubber gaskets, with just a thin film on the valve cover side. By the way, I use permatex ultra black, and it seems to work really well. Just my thoughts.
    eric

    Don't get me started, you know how i get.
    82k5, 14bff, d44, sm465, np205, 300hp350, rust
     
  10. Slayer

    Slayer 1/2 ton status

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    Yup, aircraft gasket sealant works great, and unlike RTV, it doesn't squeeze out (remember that a little goes a long way) and won't get into yuor oil passages (which can plug them up and it would take hours to find the clog). Plus the aircraft stuff can handle higher heat ranges.
     
  11. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    I hate to mix you up but I have built many motors in the past and I don't care what the manufacture says, just like 90K5 says use permatex HIGH TACK. Spary a light coat on both sides of the gasket and a LITE coat on each surface (mask off so you don't get it on stuff you don't want it on), let it sit for awhile then assemble. You will not have a leak. I don't use RTV on hardly anything except treads and I never have a leak. Even with rubber gaskets but you need to be very lite with it and let it sit. If you think you will need to pull the covers again soon then do not use anything but when you are set with them then use it with NEW gaskets. I'd rather replace the gaskets if I pull them in 2 months than reuse them. Sorry guys, just my .02

    No leaks, No drips, No errors. and a clean motor.[​IMG]

    [​IMG]<font color=red>[/b]"Rid'in HigH in my K5"[​IMG]
    ....[​IMG]<font color=blue>[/b]"8" Lift -<font color=purple>38.5's"[​IMG]....
     

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