Fel‑Pro Engine Cylinder Head Bolt Set ES 72173 for GM/Isuzu (2002–2004) — OEM‑equivalent T‑Y Replacement, Application‑Specific

Fel-Pro ES 72173 is a complete engine cylinder head bolt set engineered to replace torque-to-yield head fasteners with OE-equivalent bolts for a reliable head installation.

When a cylinder head is removed for service, damaged or single-use torque-to-yield (T-Y) head bolts must be replaced to restore clamping accuracy and engine durability. The Fel-Pro ES 72173 kit supplies new, application-specific head bolts manufactured and validated to meet or exceed original equipment standards. That helps technicians and DIYers get the correct hardware and avoid the risk of reusing bolts that could stretch or fail.

What vehicles and engines does this head bolt set fit?

This bolt set is designed for specific GM and Isuzu applications from the early 2000s. Compatibility covers select models including Isuzu Ascender, Buick Rainier, and several Cadillac variants; always verify your exact year, model, engine and trim before ordering.

• Confirmed fit for Isuzu Ascender (2003–2004) and Buick Rainier (2004).
• Covers Cadillac Escalade ESV and EXT variations (2002–2004 ranges noted).
• Also listed for 2004 Cadillac CTS in certain engine configurations.
• Use the vehicle lookup (year/make/model/engine/trim) to confirm fitment.

How do these bolts compare to original equipment?

Fel-Pro supplies bolts manufactured to match or surpass OEM specifications for strength, thread profile and finish. Each bolt is application-specific so it fits the intended head and block geometry, delivering proper clamping force and torque behavior during installation.

• Built to meet or exceed original equipment performance criteria.
• Correct thread and shoulder dimensions for intended cylinder head applications.
• Materials and heat-treatment chosen for consistent torque-to-yield characteristics.
• Validated for fit, form and function through manufacturer testing.

Why replace T-Y head bolts instead of reusing them?

Torque-to-yield bolts are tightened past their elastic limit and will stretch to achieve required clamping force. Reusing them risks improper clamp pressure, which can lead to leaks or uneven sealing. Replacing with a new Fel-Pro set restores predictable torque behavior and reduces the chance of post-repair sealing issues.

• Prevents inaccurate clamp from previously stretched bolts.
• Reduces likelihood of head gasket or sealing problems after reassembly.
• Simplifies compliance with manufacturer service procedures that call for new fasteners.
• Provides peace of mind when performing major engine repairs.

Who is this for? The Fel-Pro ES 72173 head bolt set is intended for professional technicians and competent DIY mechanics performing cylinder head removal or replacement on supported Isuzu, Buick and Cadillac models. It's the right choice when the service manual specifies new torque-to-yield head bolts, or when you want OEM-equivalent hardware validated for fit and long-term durability. Before purchase, confirm your vehicle details (year, make, model, engine and trim) to ensure correct application.