+ Reply to Thread
Results 1 to 1 of 1

Thread: Bolt Torque Specs: Dry vs Lubricated

  1. #1
    Join Date
    May 2022

    LS Head Bolt Torque Specs: Dry vs Lubricated

    Hello All,

    First time posting.

    I'm trying to find info about torqueing my LS TTY head bolts.
    I know that torqueing lubricated bolts is much less than dry bolts to acquire the same effective pre-load. I've read it can be as much as 40% depending on the lube used.

    I do see some videos with folks pouring / dipping bolts in clean engine oil while soaking the excess on a rag before install. My question is do we default the torque specs assuming a dry or lubricated fastener?

    Appreciate your opinions / feedback. Thank you.

    Note I found:

    "Dry bolt torque requirements are approximately 30-40% higher than lubricated bolts depending on the lube. If the bolt is lubricated with SAE 30 oil - the torque compared to a dry bolt is reduced approximately 40%. Note that if torque specified for a dry bolt torque is applied to a lubricated bolt - the bolt may overload and break."
    Last edited by sccu1971; 05-13-2022 at 02:20 PM.

+ Reply to Thread

Tags for this Thread

Posting Permissions

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