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Free shipping over $100 · USA & Canada
Free shipping over $100 · USA & Canada
Complete LS Refresh Bundle - Head Studs, Main Studs, Balancer, Header & Flywheel Bolts | 4.8L-6.2L Chevrolet Gen III/IV LS XPB883

LS Head, Main & Accessory Fastener Bundle

Chevrolet Gen III/IV LS · 4.8L–6.2L

PART # XPB883

Save 5% Save %
$522.54
$522.54 - $522.54
$522.54
$496.41
$496.41 - $496.41
$496.41
Availability:
in stock, ready to be shipped
Limited Lifetime Warranty
Free shipping is available on orders over $100 shipping to the USA or Canada.

Everything you need to button up a Gen III/IV LS head and bottom-end refresh — in one kit. Save 5% vs. buying each component separately.

What's Included

  • CP883 – Head Stud Kit (2004–2024 4.8L–6.2L Gen III/IV LS) — clamp your heads down for boost, nitrous, or high-compression builds.
  • MS334 – Main Stud Kit (1999–2015 4.8L–6.2L Gen III/IV LS) — superior main cap clamping for a rock-solid bottom end.
  • CP236 – Harmonic Balancer Bolt (1997–2015 LS) — the factory balancer bolt is torque-to-yield and single-use. This hardened replacement is a must when the front of the engine comes apart.
  • CP120 – 3/8" Hex Flange Header Bolt Kit (Gen III/IV LS) — premium 8740 chromoly header hardware to finish the job right.
  • CP113 – Flywheel Bolt Kit (1999–2015 Gen III/IV Small Block) — precision-engineered flywheel hardware for manual-transmission builds.

Fitment Notes

Important: Primary head bolts must all be the same length. There is a mid-year split on Gen III/IV head bolt lengths — if your engine uses two different primary bolt lengths, this kit's head studs are not the correct fit. Verify your application before ordering.

Head stud kit fits selected 2004+ Gen III/IV LS 4.8L, 5.3L, 6.0L and 6.2L applications. Main stud, balancer, header and flywheel hardware fitment years are listed per component above.

Why Bundle?

If the heads are coming off, the headers, balancer and flywheel hardware are coming off with them. Refresh every critical fastener in one order and skip the second teardown.

Your application

The right fit comes first.

Browse the compatible applications below, or check your exact vehicle before adding this product to your cart.

Check my vehicle

For selected Gen III/IV LS applications. CP883 head studs require all primary head bolts to be the same length and are listed for 2004–2024. MS334 main studs and CP113 flywheel bolts are listed for 1999–2015; CP236 balancer and CP120 header hardware are listed for 1997–2015. Confirm every included kit for your engine. CP113 is flywheel hardware for manual-transmission builds; flexplate compatibility is not claimed.

LS Head, Main & Accessory Fastener Bundle — Chevrolet Gen III/IV LS · 4.8L–6.2L

Inside the box

Know exactly what arrives.

Included components for this product.

QtyComponent
1 CP883 head-stud kit
30 M11/M8 head studs, 30 nuts, 30 hardened parallel washers, two sockets, two Allen wrenches and assembly lubricant. Primary head bolts must all have the same length.
1 MS334 main-stud kit
20 main studs (4.77-inch inner / 4.55-inch outer), 10 M8 side bolts, 30 nuts, one Allen wrench, two sockets and assembly lubricant.
1 CP236 harmonic-balancer bolt kit
One harmonic-balancer bolt, one hardened parallel washer, one socket and assembly lubricant.
1 CP120 header-bolt kit
12 hex-flange header bolts, 12 washers, one socket and assembly lubricant.
1 CP113 flywheel-bolt kit
Six flywheel bolts, one socket and assembly lubricant. For the listed manual-transmission flywheel application.

Engineering details

Every part has its own role.

Use each included component at its intended joint, with the matching hardware and component-specific assembly procedure.

Engine fastener component groups Representative head stud, main stud and additional bolt. Exact bolt types, quantities and other included components vary by bundle. Head studsMain studsAdditional bolts
Representative component groups. See the contents for exact parts and quantities.

Match each component.

Head, main and accessory fasteners serve different mounting interfaces. Match every kit to the engine and joint it is intended to secure.

Keep component specifications separate.

Use the requirements for each included kit. A shared bundle does not make every bolt or stud the same size, material or tightening specification.

Follow the component procedure.

Prepare the mating surfaces and threads, and follow the instructions for each component. Do not apply one torque value or sequence to the entire bundle.

Before you begin

A good install starts here.

Review the instructions and any application-specific requirements before you begin.

CP883 installation manual MS334 installation manual CP236 installation manual CP113 installation manual

Open the instructions for the component you are installing. Each linked document covers the named kit; its procedure and torque values apply to that component.

Before you order

Which applications does the bundle cover?

For selected Gen III/IV LS applications. CP883 head studs require all primary head bolts to be the same length and are listed for 2004–2024. MS334 main studs and CP113 flywheel bolts are listed for 1999–2015; CP236 balancer and CP120 header hardware are listed for 1997–2015. Confirm every included kit for your engine. CP113 is flywheel hardware for manual-transmission builds; flexplate compatibility is not claimed.

Is this flywheel or flexplate hardware?

CP113 supplies six flywheel bolts for the listed manual-transmission configuration. Flexplate compatibility is not claimed.

Are all included fasteners the same material?

No blanket material specification applies to the complete bundle. Use the specifications of the individual component kits.

What warranty applies?

The included fastener kits carry Limited Lifetime Warranty coverage. See the policy for terms.

California Proposition 65 warning

WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov

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