C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Valve covers for 85 corvette

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Old 10-11-2017, 04:24 PM
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cdm747
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St. Jude Donor '17-'18-'19-'20-'21-'22
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Originally Posted by Joe C
this is one area where VT3 and I disagree - personally, i'd replace the factory studs with 1/4" longer moroso studs (p/n 97020), and use fel-pro 1628 (blue) silicone rubber gaskets. clean both surface "squeaky" clean, and install dry without any kind of additional sealant, AND TORQUE TO SPEC.

your VC's don't look all that bad - i'd give them a good cleaning and a fresh topcoat with satin nickel valve cover paint.

here's a good thread on the subject...

https://www.corvetteforum.com/forums...nger-side.html

whatever way you go here, good luck!
Joe,

I noticed that these are 1/4-20 x 1 3/4 studs according to the Moroso part number above. Is this correct? I was going to order when I redo my valve covers but was concerned since everything else seems to be metric.
Old 10-11-2017, 04:33 PM
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Joe C
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Originally Posted by cdm747
Joe,

I noticed that these are 1/4-20 x 1 3/4 studs according to the Moroso part number above. Is this correct? I was going to order when I redo my valve covers but was concerned since everything else seems to be metric.
1/4-20 is correct. on the 85, and i'm guessing all L98's, everything within the basic engine is UNC = Unified National Coarse threads, whereas attachment parts and accessories are metric - plenum, runners, throttle body, etc.. a mixture of apples and oranges. enough to drive a normal person NUTS!!!
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Old 10-11-2017, 05:25 PM
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I appreciate that. I have worked on several SBC over the years but this is my first Vette. It has been a learning experience.
Old 01-20-2018, 10:25 AM
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BKnoll
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Originally Posted by VikingTrad3r
id refurb your 85 vc's using either joec's method or mine (both work and produce long lasting beautiful vc's) and personally on the 85, and early 86, i would not use anything other than cork with a correctly applied hylomar coating. the surfaces are different than the aluminum headed late 86-onward. you will likely find a hideous application of rtv under you vc's and you will spend more time trying to remove it than getting the vc's off.

hylomar + cork on iron heads is my recommendation for iron heads. notethat hylomar needs to be "printed" then seperated and left to sit for 5-10 minutes before mating surfaces.

good luck and let us know how whivh dirxn you go and how it works out.

👍

VT
What hylomar should I buy? What do you mean by printed and then separated? I apply the hylomar to the iron heads and valve covers let sit for 10 minuets and then mate them together with the gasket in between?
Old 01-20-2018, 10:40 AM
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VikingTrad3r
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this:
https://www.amazon.com/Hylomar-Universal-Blue-3-5-Tube/dp/B00XLWUO0A


and here u go!!
watch this video and more.

note that i use hylomar blue for both water and oil seals with no problem at all.

https://youtu.be/6gKbg8ah0c4https://m.youtube.com/watch?t=5s&v=6gKbg8ah0c4


Last edited by VikingTrad3r; 01-20-2018 at 10:41 AM.
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