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Thread: Larger head bolts

  1. #1
    Join Date
    Jan 2024
    Location
    Grapevine,Texad
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    5

    Default Larger head bolts

    I used a 1/2 by 13 tap to clean the threads on one side of my 6.5 block before I found out it was metric. Do they make 1/2” head bolts? A 1/2” bolt will go through the head.

  2. #2
    Join Date
    Dec 2003
    Location
    Yukon Canada
    Posts
    1,653

    Default

    Hi
    The head bolts used on the 6.2-6,5 are a torque to yield bolt.
    To answer your question, you may find some for a different engine the right lenght in 1/2 inch but who would know if they would give the same clamping pressure as the ones designed for the 6.2/6.5.
    ARP makes studs for engine headbolts which might be an option
    My guess is you are going to need to replace the block to get a reliable engine that lasts. Head gasket issues are a real problem with the 6.2/6.5 and it doesn't take much to have issues.
    You might get lucky and find some that work, and never have a problem.But you may go through all the work and cost of assembling the engine, just to have a failure down the road.
    Were you just changing heads or gaskets? Or a complete rebuild?
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  3. #3
    Join Date
    Jan 2024
    Location
    Grapevine,Texad
    Posts
    5

    Default

    Putting on new heads after a blown gasket and a cracked head.

  4. #4
    Join Date
    Jan 2024
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    Grapevine,Texad
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    Default

    I have ordered studs from ARP for both sides. Metric on one side and SAE for the other.

  5. #5
    Join Date
    Dec 2003
    Location
    Yukon Canada
    Posts
    1,653

    Default

    Make sure you read the thread about them that More Power posted.
    I hope that works for you.
    And please post your what happens, good or bad as information helps everyone
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  6. #6
    Join Date
    Jan 2001
    Location
    New Hampshire - Live Free or Die
    Posts
    6,070

    Default

    If all you're doing is running an SAE tap down the metric threads, I'd be very concerned that the resulting threads would be strong enough.
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC, John Deere X758
    New ride: MB GLS450 - most stately
    Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510

  7. #7
    Join Date
    Jan 2024
    Location
    Grapevine,Texad
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    Default

    I got the truck running in April. I have put about 1,000 miles on it with no issues.

  8. #8
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,629

    Default

    Thanks for the update. Good luck!
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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