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Old 12-28-2006, 02:41 PM
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Leaking valve cover gasket!

I have a 383, built on a 1970 LT-1 that has 461X heads. Teh old iron heads don't have a flat edge for the gasket surface, so I have tried a couple different gaskets and haven't found anything that will seal 100%. Any ideas?

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Last edited by jsdailey; 12-28-2006 at 02:44 PM. Reason: Change subject
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Old 12-28-2006, 02:52 PM
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My idea on that runs to putting a small bead of silicone gasket sealer..works fine if you are not taking the valve covers off all the time for tuning..

I think Moroso has some good ones as well..Might check that source..

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Old 12-28-2006, 04:59 PM
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Is it leaking from top of gasket (under valve covers) or under the gasket (top of head)? Or is it hard to tell when you remove it? Depending on where its usually leaking is were i would put the sealer. So that way you can still remove the valve covers without having to re-seal and put on new gaskets. So either seal the gasket to the head or seal it to the valve cover. Thats just my take on the issue. Did it on my truck with edelbrock gasgacinch. Glued the gasket to the covers.
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Old 12-28-2006, 06:01 PM
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valve cover leaks

are you using the tin valve covers or some much better CAST covers ??
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Old 12-28-2006, 06:32 PM
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Carefully use adhesive, following the instructions, on the valve covers and install the gaskets. Clean off the shoulder of the heads where the gaskets mount and install the covers. Tighten carefully and do not over tighten, using the original torque values works wonders.
Retighten if necessary after the first few hours of engine run time.
It ain't rocket science but it does require some care and finesse.
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Old 12-28-2006, 07:55 PM
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Rarely have a problem......not overtightening is the key. Applies to oil pan gaskets too. Also, make sure the surface of the tin covers are flat.
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Old 12-28-2006, 08:14 PM
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Try these gaskets.. I had some problems with my Dart heads.. The dont have the little bosses that hold the gasket from moving that are in each corner of the head.. These are steel with rubber on each side.. Real nice gasket..

Fel Pro Valve Cover Gasket Set: Perma Dry Plus
Part Number: VS12869T

http://www.partsamerica.com/ProductD...pe=107&ptset=A


Quote:
Originally Posted by jsdailey
I have a 383, built on a 1970 LT-1 that has 461X heads. Teh old iron heads don't have a flat edge for the gasket surface, so I have tried a couple different gaskets and haven't found anything that will seal 100%. Any ideas?
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Old 12-28-2006, 09:35 PM
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Get the FelPro molded-rubber valve cover gaskets with the stainless steel inner core and built in crush stops, part number 1628.
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Old 12-28-2006, 09:37 PM
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VALVE COVER HOLD DOWNS (sold by Mr. Gasket)

6395 gold iridite
6396 chrome
6397 black

These help spread the bolt force out for more even clamping.

Be sure your cover's flanges are straight. Use a good quality cork gasket. Glue it to the cover with 3M Super Weatherstrip Adhesive (yellow or black). Coat the head side with Permatex Aviation (#3) or Super-300 liquid sealant, let it sit for a few minutes, then paint some more on it. Install the cover, using the above-mentioned load spreaders, and don't overtighten the bolts.
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