Results 1 to 15 of 15

Thread: New 350 build leaking

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Administrator
    Join Date
    May 2011
    Location
    Lakes Region, NH
    Age
    54
    Posts
    3,867
    Definitely hose everything off before making any decisions.

    Do you know what was installed for a head gasket? Steel shim type or composition?

  2. #2
    Fuel Injected! Resin's Avatar
    Join Date
    Aug 2023
    Posts
    29
    I used a composite gasket from Enginetech.

  3. #3
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,055
    that's really fresh oil, buddy. you must have pinched or damaged a gasket during installation, mistorqued something, missed some RTV'd corners that some GM gaskets require, or had mating surfaces not...uh...mating. clean it, run it drive it, and check again, but i think that engine is coming back out to be re-gasketed.

  4. #4
    Fuel Injected!
    Join Date
    Jan 2021
    Location
    Deep in the heart of Texas
    Posts
    73
    That is really odd all four corners have leaks. Oil through the head is merely a static drain back into the motor. Water on the other hand is pressurized. Doesn’t appear to be water though. Is it blowing out the intake valley and finding a leak path, if not the head gaskets would be highly suspect and didn’t seal properly.

  5. #5
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,055
    when i see leaks from a fresh engine on more than one surface it must be some fundamental issue

    damaged or incorrect gasket(s)

    mistorqued fasteners

    machinist needs to be taken out back for "a chat"

  6. #6
    Administrator
    Join Date
    May 2011
    Location
    Lakes Region, NH
    Age
    54
    Posts
    3,867
    Lots of maybes but it's likely something simple.

    What head bolt torque value did you use?
    Can you see any leakage from under the valve covers?

  7. #7
    Fuel Injected!
    Join Date
    Nov 2017
    Location
    Californiacation
    Age
    57
    Posts
    834
    Hiya's,
    I'll throw this out there...I had a set of EngineTech head gaskets leak water as I was filling the radiator, I was hoping a couple heat cycles would do something, nope. The fire ring wouldn't compress enough for the rest of the gasket seal to work :(
    -Carl

Similar Threads

  1. 454 TBI Build
    By Chutchcroft in forum EFI Tune
    Replies: 3
    Last Post: 06-22-2020, 01:02 AM
  2. Which way to go on 454 TBI build?
    By DLV555 in forum GM EFI Systems
    Replies: 28
    Last Post: 02-22-2019, 04:06 PM
  3. 355 TBI build help.
    By old truck guy in forum GM EFI Systems
    Replies: 32
    Last Post: 05-05-2015, 04:45 AM
  4. 454 TBI Build
    By Sla90lx in forum GM EFI Systems
    Replies: 14
    Last Post: 10-02-2014, 07:22 AM
  5. questions about tbi build
    By 4thgentruck in forum GM EFI Systems
    Replies: 12
    Last Post: 03-11-2013, 05:47 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •