Basic valve cover questions

Discussion in 'Tech Discussion' started by Colin, Apr 21, 2018.

  1. Colin

    Colin Full Access Member

    Posts:
    59
    Likes Received:
    40
    Joined:
    Mar 12, 2018
    Location:
    Covington, GA
    First Name:
    Colin
    Truck Year:
    1978
    Truck Model:
    K10 Silverado
    Engine Size:
    350 cu. in.
    I'm replacing the stamped steel valve covers on the 350 with covers from an '84 'Vette.
    They're made from magnesium or aluminum and are thicker than the current covers.
    My question is "Is there a preferred gasket material for these (cork, rubber, silicone) and
    is gasket sealant needed or required. I've researched online and it seems to run the gamut.
    I only want to do this once and hate going back looking for leaks.
    Any previous experiences or knowledge is appreciated.
    Thanks.
     
    Rusty Nail likes this.
  2. Colin

    Colin Full Access Member

    Posts:
    59
    Likes Received:
    40
    Joined:
    Mar 12, 2018
    Location:
    Covington, GA
    First Name:
    Colin
    Truck Year:
    1978
    Truck Model:
    K10 Silverado
    Engine Size:
    350 cu. in.
    Sorry... got posted twice.
     
  3. Shorty81

    Shorty81 Member

    Posts:
    37
    Likes Received:
    54
    Joined:
    Mar 19, 2018
    Location:
    North West ohio
    First Name:
    Darren
    Truck Year:
    86
    Truck Model:
    K20
    Engine Size:
    496
    I installed some old aluminum vette style covers. I had to use extensions because the rockers were rubbing. I used rubber gasgets, no sealant. But this is a bbc.

    IMG_20171124_150352.jpg
     
  4. WFO

    WFO Full Access Member

    Posts:
    601
    Likes Received:
    315
    Joined:
    Jan 6, 2017
    Location:
    Texas Panhandle
    First Name:
    Dan
    Truck Year:
    1986
    Truck Model:
    K20
    Engine Size:
    350
    I use the Fel-Pro cork gaskets, with sealer to the covers, and a thin layer of grease where they mate to the heads.
     
    idahovette likes this.
  5. 75gmck25

    75gmck25 Full Access Member

    Posts:
    260
    Likes Received:
    84
    Joined:
    Oct 13, 2016
    Location:
    VA
    First Name:
    Bruce
    Truck Year:
    1975
    Truck Model:
    K25
    Engine Size:
    5.7
    I always had trouble with standard cork gaskets and steel valve covers leaking a little. I switched to the rubber gaskets with a metal core and they seal much better. The metal core keeps them aligned properly and the rubber makes the seal. Fel-Pro also makes a steel/cork-rubber laminated gasket.

    Bruce
     
    Paladin likes this.
  6. Rusty Nail

    Rusty Nail Build the wall - deport them all!

    Posts:
    2,849
    Likes Received:
    1,106
    Joined:
    Jan 29, 2015
    Location:
    America
    First Name:
    Rusty
    Truck Year:
    1977
    Truck Model:
    C20
    Engine Size:
    350
    I have the same covers, magnesium, congratulations!

    I like fel pro blue silicone gaskets with the steel insert and install them dry with a two finger tight..
     
    Chevynut46 and shiftpro like this.
  7. bucket

    bucket Super Moderator Staff Member

    Age:
    36
    Posts:
    16,141
    Likes Received:
    1,907
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    The rubber gaskets with steel core work well. But the Mr Gasket ultra seal line of cork gaskets work great too. The cork has a thin fancy coating of some kind that seals great. And cheap.

    I install both dry and both are often reusable too.
     
  8. Paladin

    Paladin Full Access Member

    Age:
    62
    Posts:
    182
    Likes Received:
    242
    Joined:
    Jan 1, 2018
    Location:
    Texas
    First Name:
    Mike
    Truck Year:
    1985
    Truck Model:
    C30 Silverado Crew Cab
    Engine Size:
    468
    X 2
     
  9. Jerry phillion

    Jerry phillion Full Access Member

    Posts:
    54
    Likes Received:
    5
    Joined:
    Aug 10, 2017
    Location:
    Saginaw, mi.
    First Name:
    Jerry
    Truck Year:
    87
    Truck Model:
    R10
    Engine Size:
    350
    GM always used heads with cast mounting surfaces originally.
    I don't know when they started to machine this surface, but that
    Could make a diff. I'm curious to know as I want to replace mine
    Too.
     
  10. Colin

    Colin Full Access Member

    Posts:
    59
    Likes Received:
    40
    Joined:
    Mar 12, 2018
    Location:
    Covington, GA
    First Name:
    Colin
    Truck Year:
    1978
    Truck Model:
    K10 Silverado
    Engine Size:
    350 cu. in.
    Posted in error...

    05.JPG

    Motor 2.JPG
     
    Last edited: May 5, 2018
    theblindchicken and Rusty Nail like this.
  11. HotRodPC

    HotRodPC Administrator Staff Member

    Posts:
    43,035
    Likes Received:
    2,534
    Joined:
    Aug 29, 2010
    Location:
    OKC, OK
    First Name:
    HotRod
    Truck Year:
    85
    Truck Model:
    Silverado K10 to K20 Conversion
    Engine Size:
    6.2 to Gas???
    This is what I do, except I use neoprene gaskets. If you do it this way, you can usually remove the valve covers if you have to for some reason and but them right back on with a new coat of grease on the head side so they don't stick and tear the next time you need to remove the covers.
     
  12. Colin

    Colin Full Access Member

    Posts:
    59
    Likes Received:
    40
    Joined:
    Mar 12, 2018
    Location:
    Covington, GA
    First Name:
    Colin
    Truck Year:
    1978
    Truck Model:
    K10 Silverado
    Engine Size:
    350 cu. in.
    I went with rubber gaskets without any sealant. After preparing the covers
    by sanding, painting and re-sanding paint off the ribs, this is what I ended
    up with.

    Before...

    05.JPG

    After...

    Motor 2.JPG

    Now have to work on the plug wire routing.
     
  13. HotRodPC

    HotRodPC Administrator Staff Member

    Posts:
    43,035
    Likes Received:
    2,534
    Joined:
    Aug 29, 2010
    Location:
    OKC, OK
    First Name:
    HotRod
    Truck Year:
    85
    Truck Model:
    Silverado K10 to K20 Conversion
    Engine Size:
    6.2 to Gas???
    Hmmm, you do realize that air intake tube is a total 100% waste and not even needed and not even doing a damn thing for that air cleaner right??? I'd have removed that long ago and left it off with that air cleaner.
     
    donnieray and idahovette like this.
  14. Colin

    Colin Full Access Member

    Posts:
    59
    Likes Received:
    40
    Joined:
    Mar 12, 2018
    Location:
    Covington, GA
    First Name:
    Colin
    Truck Year:
    1978
    Truck Model:
    K10 Silverado
    Engine Size:
    350 cu. in.
    Yeah, I know. I just wanted a little chrome under the hood.
    Humor me...
     
    donnieray and Rusty Nail like this.
  15. Rusty Nail

    Rusty Nail Build the wall - deport them all!

    Posts:
    2,849
    Likes Received:
    1,106
    Joined:
    Jan 29, 2015
    Location:
    America
    First Name:
    Rusty
    Truck Year:
    1977
    Truck Model:
    C20
    Engine Size:
    350
    LoL
     

Share This Page