LT-1 Valve cover with spacers

Discussion in 'Engine Topic' started by 1981zapper, Jun 27, 2021.

  1. 1981zapper

    1981zapper Veteran Member

    Messages:
    1,420
    Likes Received:
    8
    Joined:
    Apr 28, 2009
    Location:
    Great White North
  2. G72Zed

    G72Zed Veteran Member

    Messages:
    3,054
    Likes Received:
    1,525
    Joined:
    Sep 8, 2015
    Location:
    Canada
    With a double gasket, it should clear the extra poly lock height of those rockers. It depends on the cylinder head casting as well, the newer aftermarket heads have tall-raised rails and really to use original Z/28-LT1 valve covers such in your case.

    As an example, I use the original valve covers with a 7/8th spacer and cleared my roller rocker and stud girdle as well, but the heads had raised rails compared to the old iron head door stops I was using.

    Only way is to use clay on the top of the rocker studs and clamp everything down, it will tell you what you need for a spacer. There's another company that make 1" spacers, but not billet, just cast spacers.
     
    1980RS likes this.
  3. kenny77

    kenny77 Veteran Member Lifetime Gold Member

    Messages:
    3,092
    Likes Received:
    269
    Joined:
    Jul 31, 2001
    Location:
    Ft. Lauderdale, FL
    It's not the rocker that interferes with that cover. It's the height of the locks,nuts
     
  4. ChevyReb

    ChevyReb Veteran Member Lifetime Gold Member

    Messages:
    4,348
    Likes Received:
    224
    Joined:
    Feb 4, 2003
    Location:
    SC
    You mean like the poly locks that are in G72Zeds 1st sentence above?

    Before you buy the spacers make a stack of washers the same thickness and use the clay like G72Zed recommended and torque them down and you will know what you need.
     
  5. 1981zapper

    1981zapper Veteran Member

    Messages:
    1,420
    Likes Received:
    8
    Joined:
    Apr 28, 2009
    Location:
    Great White North
    I'm currently building the engine, I will be going with Edelbrock Performer RPM heads, and will be using poly nuts
     
  6. 1981zapper

    1981zapper Veteran Member

    Messages:
    1,420
    Likes Received:
    8
    Joined:
    Apr 28, 2009
    Location:
    Great White North
    I don't have the engine built yet, looking to buy all my parts at once,

    I see the spacers are offered in
    3/8",
    1/2"
    1"
    thickness
     
  7. 70lt1z28

    70lt1z28 Veteran Member Gold Member

    Messages:
    4,400
    Likes Received:
    1,041
    Joined:
    Oct 3, 1999
    Location:
    Beavercreek, Ohio, USA
    Here are a few photos of how close it is with standard studs and locknuts with the drippers and regular thickness gaskets:

    Photo Jun 03, 9 35 48 PM.jpg Photo Jun 03, 9 35 22 PM.jpg Photo Jun 03, 9 35 33 PM.jpg

    When setting the valve covers, it is a good idea to push them up towards the intake while tightening to give them just a bit more clearance.
     
    G72Zed likes this.
  8. G72Zed

    G72Zed Veteran Member

    Messages:
    3,054
    Likes Received:
    1,525
    Joined:
    Sep 8, 2015
    Location:
    Canada
    I think the E RPM heads will have a tallish rail to start with.

    And looking at 70lt1z28 pic's, it shows how GM engineered those drippers to work effectively, they would not have wasted any money in R&D if it was a waste of time and not important.

    This is one of the main reasons I incorporate a stud girdle with RR, be it hyd or solid, FT or roller as many, if not all of the aftermarket "tall" valve covers do not have drippers, but the GM polished ones with the logo/chevrolet has them .

    A pic says a 1,000 words, nice pic 70lt1z28, thanks for sharing this.
     
    sandlapper likes this.
  9. 73RATTYZ28

    73RATTYZ28 Veteran Member

    Messages:
    568
    Likes Received:
    45
    Joined:
    Feb 23, 2001
    Location:
    White Plains NY USA
    My full roller rockers on my blueprint 383 with aluminum heads cleared the LTI covers without a spacer so try the clay method. I was thrilled because those spacers look awful to me.
     
  10. COPO

    COPO Veteran Member Lifetime Gold Member

    Messages:
    21,046
    Likes Received:
    2,582
    Joined:
    Sep 15, 1999
    Location:
    Ontario, Canada
    The shorter lock nuts almost clears them, so a thicker cover gasket will work.
     

Share This Page