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Free shipping over $100 · USA & Canada
Free shipping over $100 · USA & Canada
Head & Main Stud Combo Kit - 1983–1998 3.9L 4BT 4CYL Dodge Cummins CP896-CP884

Head & Main Stud Combo Kit

3.9L 4BT Cummins

1983–1998

PART # CP896-CP884

$366.43 - $366.43
$366.43
$366.43 - $366.43
$366.43
Availability:
Low stock
Limited Lifetime Warranty
Free shipping is available on orders over $100 shipping to the USA or Canada.
Fortify the 4BT From Top to Bottom.

The 4BT earned its reputation by refusing to quit — so build it to match. This combo pairs our 3.9L 4BT head stud kit with our main stud kit, locking down both ends of the engine in a single upgrade. Head studs seal the cylinder head against boost and heat up top, while main studs stabilize the crankshaft main caps down below. Whether it's powering a swap build, a work truck, or an off-road rig, this is the foundation that holds up under pressure.

Why Drivers Choose XOTIC PERFORMANCE™
  • Top-to-Bottom Strength – Head studs keep your head gasket sealed under turbo pressure and heat, while main studs add bottom-end stability and help prevent main cap walk under load.
  • Superior Clamping Force – Studs torque cleanly and stay stationary instead of twisting like bolts, delivering more consistent clamp load and reducing wear on your block and head threads.
  • XOTIC 7200 Material – Built from our 7200-series alloy for greater tensile and yield strength than standard 8740 chromoly, with threads rolled after heat treatment for maximum fatigue life.
  • Everything You Need – Complete head stud and main stud hardware in one kit — studs, 12-point nuts, hardened washers, rocker bolts, assembly lubricant, and install tools.
  • Limited Lifetime Warranty – Every fastener is backed by XOTIC PERFORMANCE™ for total peace of mind.

The smart choice for 4BT builders who want to do it once and do it right — seal the head and secure the bottom end in a single upgrade.

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 the listed 3.9L four-cylinder 4BT Cummins applications. Includes CP896 head hardware and CP884 main hardware.

Head & Main Stud Combo Kit — 3.9L 4BT Cummins

Inside the box

Know exactly what arrives.

Included components for this product.

QtyComponent
1 CP896 head-stud kit
18 M12 head studs in three lengths, 18 nuts, 18 hardened parallel washers and 4 M8 rocker-pedestal bolts.
1 CP884 main-stud kit
10 main studs, 10 nuts and 10 hardened parallel washers. The bundle includes three sockets, an Allen wrench and assembly lubricant.

Engineering details

Two joints. Defined roles.

Head studs secure the cylinder head to the block. Main studs secure the crankshaft main-bearing caps. Use the hardware and procedure specified for each assembly.

Head and main stud groups Representative head stud and main stud with flanged nuts and washers. Stud lengths, quantities and supplementary hardware vary by kit. This is not an engine installation layout. Head studsMain studsNuts + washers
Representative component groups. See the contents for exact parts and quantities.

Head hardware

The CP896 kit supplies the head studs and accompanying hardware used to secure the cylinder-head assembly.

Main hardware

The CP884 kit supplies the main studs and accompanying hardware used at the crankshaft main-bearing caps.

Keep each procedure with its kit

Stud positions, lubricant requirements and tightening procedures are component-specific. Use the separately labeled installation documents for each included kit.

XOTIC 7200 / Material comparison

Tensile & yield strength.

Two measures of strength. Explore the comparison for XOTIC 7200 alloy and 8740 chromoly steel.

Tensile strength

The maximum tensile stress a material withstands before failure.

Original tensile comparison diagram: XOTIC 7200, 232K PSI, in solid blue; 8740 chromoly steel, 222K PSI, in dashed graphite.
Existing material comparison illustration. Not a product-specific kit test.
XOTIC 7200 series

232K PSI

8740 chromoly steel

222K PSI

Yield strength

The stress at which a material begins to deform permanently.

Original yield comparison diagram: XOTIC 7200, 212K PSI, in solid blue; 8740 chromoly steel, 201K PSI, in dashed graphite.
Existing material comparison illustration. Not a product-specific kit test.
XOTIC 7200 series

212K PSI

8740 chromoly steel

201K PSI

The original comparison identifies an M14 × 237 specimen. This material comparison relates to the alloy used in the included head and main studs.

Original method note: ISO 6892-1:2016 or ASTM A370 / ASTM E8/E8M in the US.

Material specification

220–240K PSI

Strength specification

The XOTIC 7200 head and main studs in this bundle have a published tensile-strength range of 220,000–240,000 psi. Tensile strength describes the material under tension; it is not an installed clamping-force or horsepower rating.

View the test documentation

The linked ATRONA report records a 240,000 psi tensile result for a submitted stud tested in May 2020. This result applies to the submitted sample.

View source report

See the details

Behind the product.

Watch the video selected for this product.

XOTIC videoWatch on YouTube

Before you begin

A good install starts here.

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

CP896 head-stud installation manual CP884 main-stud 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 kits are included?

This bundle contains one CP896 head-stud kit and one CP884 main-stud kit. The included-kit list identifies their hardware and links to each component.

Does it fit my engine?

For the listed 3.9L four-cylinder 4BT Cummins applications. Includes CP896 head hardware and CP884 main hardware.

Do both kits use the same installation procedure?

No. The head and main assemblies have separate hardware arrangements and tightening procedures. Use each kit’s labeled manual; do not transfer torque values between them.

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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