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Where do the knock sensors go on a 6.0L iron block?

It depends on the block generation:

Last updated

  • Gen III 6.0 (LQ4, LQ9): one-wire sensors in the valley under the intake. ICT's 551216-KN30 relocation adapters move them to the side of the block (with extension WEKN030-60).
  • Gen IV 6.0 (LY6, L96): two-pin sensors on the lower sides of the block above the oil pan rail, one M8-1.25 bolt each. Adapter 551216-KN40 + extension WEKN040-12 can move both to one side for clearance.
  • Gen IV sensors on a Gen III block also works, with wire adapter WAKN034-36.

Standalone ECUs often run with knock sensors disabled; with a stock GM ECU, keep them working.

What we recommend

On a Gen III 6.0 the knock sensors sit under the intake in the valley cover. If valley access is a pain in your swap, what we've seen work is relocating them to the sides of the block using the existing holes, drilling and retapping if needed, which is where Gen IV engines mount them anyway. Plan on wiring extensions to reach the new locations.

Check this first:

  • Make sure the sensor type matches your PCM's generation
  • Confirm the block-side holes are usable before committing to relocation

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

Check this first

  1. Confirm codes are sensor circuit (P0327/P0332), not actual knock

Try this, then this

  1. RTV dam + new valley sensors — cheapest. Worked if: codes stay gone
  2. Relocate to side of block with Gen IV sensors — permanent fix. Worked if: codes stay gone through rain

How you know it's fixed

  • Codes gone after relocation with correct harness extension

Still not fixed?

  • Tune may need knock sensor type updated for Gen IV sensors

Every option we know of

Maker / productPart #FitsPriceWhereStatus / notes
GM
Gen IV side-mount knock sensors		12621273relocation on Gen III blocks with bossesabout $35 eaGM dealerIn production
needs harness extension + possible tune change
DIY
RTV dam on valley sensors		n/aGen III valley$8garageDIY
repeat failure possible

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: 2-3 hours

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