EPOXY54

Build Stronger.

Race Protected.

Drive Daily.

The closed deck system trusted by the world's fastest engines.
  • 21,000 PSI Compressive Strength
  • Full OEM Cooling Retained
  • 1:1 Thermal Expansion to Aluminum
  • No Machining Required (DIY Install)
Shop EPOXY54 - Starting at $124.99 Watch Installation Video
Trusted across platforms:
VQBMWSubaruVolvoHondaChevroletFordTopFuel Applications

1000+ Builds

Trusted globally

Proven up to 1800+ WHP

Tested performance

0 Reported Failures

Field tested

Why Engine Builders Choose EPOXY54

  • Same strength as $2,000+ closed deck solutions
  • DIY install - no machine shop required
  • Ready to run in just 24 hours
  • Maintains factory cooling efficiency

Why EPOXY54 is Your Best Choice

Click any section below to learn more

1

What is EPOXY54?

Discover how this revolutionary epoxy can strengthen your block without compromising performance.

Learn More →
2

The Truth About Epoxy

See the proof: 21,000 PSI strength, full OEM cooling retained, and chemical resistance that lasts.

Learn More →
3

Real Results

Read testimonials from builders running 600-1700+ WHP with EPOXY54 in their blocks.

Learn More →

The Smart Alternative to Closed Deck

EPOXY54 is a custom-engineered, high-temperature epoxy specifically designed to reinforce engine blocks. It provides the strength of a closed deck system while maintaining OEM cooling efficiency—all at a fraction of the cost.

Traditional closed deck solutions require extensive machining, high costs, and often warp cylinders during install. EPOXY54 gives you the strength you need without the compromises.

Trusted by the fastest engines in the ¼ mile, EPOXY54 has proven itself in race and street applications.

Cure Time: 24 Hours Strength: 21,000 PSI Compatibility: All Open Deck Engine Blocks

21,000 PSI Strength

Compressive strength that rivals closed deck solutions at a fraction of the cost.

Thermal Matched

Engineered thermal expansion rate matches aluminum perfectly—no cracking or separation.

DIY Friendly

No machining required. Install before or after machine work without affecting dimensions.

Cost Effective

Achieve closed deck performance for significantly less than traditional alternatives.

Debunking the Myths

Let's address the common misconceptions about epoxy block reinforcement with facts.

Myth: Epoxy will overheat your engine

Truth

EPOXY54 maintains stock cooling efficiency. The coolant passages you drill preserve full OEM cooling properties.

Myth: Epoxy is weak and will crack

Truth

21,000 PSI compressive strength with thermal expansion matched to aluminum prevents cracking under extreme conditions.

Myth: Coolant will deteriorate epoxy

Truth

Chemical-resistant formula specifically designed to withstand coolant exposure indefinitely.

Myth: The epoxy will melt from engine heat

Truth

EPOXY54 is a high-heat epoxy that withstands normal engine temperatures. Users have reported warped cylinder heads from water pump failures without any epoxy damage. In short, if your engine is getting hot enough to damage the epoxy, you have bigger problems on your hands.

How EPOXY54 Compares

Feature
EPOXY54
Closed Deck
Cement
Cost
Starting at $124.99
$2,000+
$150
Strength (PSI)
21,000
25,000
8,000
OEM Cooling
Yes
Yes
No
Machining Required
No
Extensive
No
Cure Time
24 hrs
N/A
N/A
Chemical Resistant
Yes
Yes
No
Daily Driveable
Yes
Yes
Limited
Thermal Expansion
1:1 with Aluminum
1:1 with Aluminum
Expands/Shrinks

Featured products

Blog posts

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  • Cast Iron Engine Block Filler (Hard Blok & Moro...

    EPOXY54 was originally engineered to reinforce aluminum engine blocks, with a thermal expansion rate closely matched to aluminum for long-term stability under extreme heat and load. However, over time, real-world use...

    Cast Iron Engine Block Filler (Hard Blok & Moro...

    EPOXY54 was originally engineered to reinforce aluminum engine blocks, with a thermal expansion rate closely matched to aluminum for long-term stability under extreme heat and load. However, over time, real-world use...

  • EPOXY54 Installation Accessory Kit: What It Is (and What It Isn’t)

    EPOXY54 Installation Accessory Kit: What It Is ...

    When working with EPOXY54, most installers already have their own tools, methods, and preferences. That’s exactly why the EPOXY54 Installation Accessory Kit exists — not as a required component, and...

    EPOXY54 Installation Accessory Kit: What It Is ...

    When working with EPOXY54, most installers already have their own tools, methods, and preferences. That’s exactly why the EPOXY54 Installation Accessory Kit exists — not as a required component, and...

  • The Ultimate Engine Build List

    Building a strong engine isn’t just about forged pistons and big turbos—it starts with the block. See why Epoxy54 block filler is the foundation every builder should add to their...

    The Ultimate Engine Build List

    Building a strong engine isn’t just about forged pistons and big turbos—it starts with the block. See why Epoxy54 block filler is the foundation every builder should add to their...

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