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Do I need new head bolts after head-gasket work on a 6.0L?

Yes. GM Gen III and IV engines use torque-to-yield head bolts, and those belong in the trash once they've been torqued. They're one-use.

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Your options:

  • New factory-style bolts.
  • Upgraded aftermarket head bolts — a good budget choice for mild engines.
  • Head studs — better for serious power or boost. Studs pull in a straight line when torqued, so clamping is more accurate and the block threads aren't twisted.

Also scrap any bolt or stud that rusted from a leaking head gasket or has damaged threads.

What we recommend

Yes. Stock LS head bolts are torque-to-yield, and we recommend always installing new bolts rather than reusing them. Stock fasteners go on with an initial torque followed by an angle-turn sequence; if you step up to ARP bolts, follow their sequence, which we've seen run at 30/60/90 lb-ft. Choosing an MLS head gasket doesn't change the specified fastener torque by itself. If the gasket let go because of an overheat, have the heads milled or trued while you're in there.

Check this first:

  • Confirm which torque sequence applies to the exact bolts you bought (stock torque + angle vs ARP)
  • Check head and deck flatness if the engine overheated

Careful: Reusing torque-to-yield head bolts risks poor clamping and a repeat head-gasket failure.

Based on what we've seen work across our own builds, our friends' builds and the wider LS community, reviewed by our lead shop tuner (over 20 years of LS and LT tuning experience). Every combination is different, so use at your own risk and check our safe tuning limits before any wide-open pass.

Go deeper

Try this, then this

  1. Use new stock bolts with 22 ft-lb + angles — cheap and correct. Worked if: seals hold
  2. Upgrade to ARP with moly and kit sheet specs — reusable, stronger clamp. Worked if: torque verified

How you know it's fixed

  • New bolts torqued in sequence with angle gauge; no coolant in oil after heat cycles

Still not fixed?

  • Have block and heads checked for warpage/deck surface

Key numbers

WhatValue
Stock head bolts are single-use torque-to-yieldreplace after one use

Every option we know of

We may earn a commission when you buy through links on this page.

Maker / productPart #FitsPriceWhereStatus / notes
GM
stock TTY head bolt set		12498545Gen III LSabout $50Buy
GM dealer		In production
single use only
ARP
head bolt kit (134-3609)		134-3609Gen III/IV LSabout $180Buy
Summit/Jegs		In production
specs vary by kit/lube — follow the included sheet
ARP
head stud kit		234-4110Gen III/IV LSabout $450Buy
Summit/Jegs		In production
DIY
reused stock bolts		n/anothing safely$0n/aDIY
TTY bolts must not be reused

Prices are approximate as of September 2026. We list every option we know of, including small shops and used parts we can't link to. Confirm fitment with the seller.

Time and cost: Head R&R: 6-10 hours; bolts ~$50-450

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