Product Description
Michigan Motorsports LS 2004+ Head Bolt Kit
Fits LS2 LS3 LS6 LQ4 LQ9 LY5 LY6 LM7 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L
The Michigan Motorsports LS 2004+ Head Bolt Kit is a stock-replacement, torque-to-yield (TTY) fastener set engineered to meet OEM specifications for mid-2004 through 2014 LS-based engines. These bolts deliver proper clamping force and sealing reliability on rebuilds or top-end service. Note: Torque-To-Yield head bolts are single-use and must be replaced after being torqued.
Fitment & Identification
GM used two different LS head bolt styles. Verify which your engine requires:
- 1997–2003 engines (early Gen 3): 8 × 155 mm bolts, 2 × 100 mm bolts, 5 × 45 mm bolts.
- Mid-2004–2013 engines (late Gen 3 / Gen 4): 10 × 100 mm bolts, 5 × 45 mm bolts (this kit).
Model Year 2004 note: If 8 of the 10 larger head bolts per head are longer and 2 are shorter, you need the 1997–2003 style. If all 10 larger bolts are the same length, use the 2004-later style (this kit).
Choose Your Kit
- One Head: Enough fasteners for a single cylinder head.
- Both Heads (Complete Engine): Fasteners for two cylinder heads.
Why Choose Michigan Motorsports
- Direct OEM-style replacement for mid-2004–2013 LS applications.
- Correct mixed-length assortment for the late bolt pattern (10 × 100 mm, 5 × 45 mm per head).
- Reliable torque-to-yield design for consistent clamping and sealing.
Important
- These bolts are single-use: do not reuse after torquing—they stretch by design.
- Always follow OE torque and angle procedures.
Brought to you by Michigan Motorsports – trusted LS/LT engine components for street and performance builds.
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Best OE quality bolts
Torque to ange just as instructed simple install
