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What Coolant Should I Use for My Engine?

Proper coolant selection is critical to maintaining engine temperature, preventing corrosion, and maximizing the lifespan of your cooling system components. All BluePrint Engines crate engines should be operated with a high-quality coolant mixed according to the coolant manufacturer's recommendations.

 Recommended Coolant Types

The following coolant types are approved for use in BluePrint Engines applications:

  • Conventional Green Ethylene Glycol Coolant
  • HOAT (Hybrid Organic Acid Technology) Coolants
  • OAT (Organic Acid Technology) Coolants
  • Extended-Life Coolants that are aluminum-compatible

Always follow the coolant manufacturer's mixing and service interval recommendations.

Coolant Recommendations by Engine Family

Small Block Chevrolet Engines

Including:

  • 305
  • 327
  • 350
  • 355
  • 383
  • 400-based combinations

Recommended Coolant:

  • Conventional Green Coolant or equivalent extended-life coolant
  • 50/50 mix with distilled water

Big Block Chevrolet Engines

Including:

  • 396
  • 427
  • 454
  • 496
  • 540

Recommended Coolant:

  • Conventional Green Coolant or equivalent extended-life coolant
  • 50/50 mix with distilled water

LS Series Engines

Including:

  • LS1
  • LS2
  • LS3
  • LS376
  • LS427
  • LS-based crate engine combinations

Recommended Coolant:

  • Dex-Cool® compatible OAT coolant or equivalent
  • 50/50 mix with distilled water

Small Block Ford Engines

Including:

  • 302
  • 306
  • 347
  • 351W
  • 408
  • 427W

Recommended Coolant:

  • Conventional Green Coolant or equivalent extended-life coolant
  • 50/50 mix with distilled water

Ford FE Engines

Including:

  • 390
  • 427 FE

Recommended Coolant:

  • Conventional Green Coolant or equivalent extended-life coolant
  • 50/50 mix with distilled water

Chrysler Small Block Engines

Including:

  • 318
  • 340
  • 360

Recommended Coolant:

  • Conventional Green Coolant or equivalent extended-life coolant
  • 50/50 mix with distilled water

Chrysler Big Block Engines

Including:

  • 440 and similar B/RB platform engines

Recommended Coolant:

  • Conventional Green Coolant or equivalent extended-life coolant
  • 50/50 mix with distilled water

Chrysler Gen III HEMI Engines

Including:

  • 5.7L HEMI
  • 6.4L HEMI
  • 426 HEMI-based Gen III combinations

Recommended Coolant:

  • OAT coolant meeting Chrysler specifications
  • 50/50 mix with distilled water

Distilled Water Requirement

BluePrint Engines strongly recommends using distilled water when mixing coolant concentrate.

Using tap water may introduce:

  • Minerals
  • Calcium deposits
  • Corrosion-causing contaminants

These contaminants can reduce cooling system efficiency and potentially shorten component life.

Coolants to Avoid

Do not use:

Straight water for extended operation
Straight coolant without proper dilution
Coolants contaminated with oil or debris
Coolant mixtures containing incompatible coolant chemistries
Saltwater, well water, or untreated tap waterIf changing coolant types, completely flush the cooling system before refilling.

Cooling System Capacity

Cooling system capacity varies by vehicle, radiator, hose routing, heater core configuration, and accessory package. Always fill and bleed the cooling system according to the vehicle manufacturer's procedures.

Warranty Considerations

Damage resulting from improper coolant selection, contaminated coolant, inadequate freeze protection, or neglected cooling system maintenance may not be covered under warranty.

Additional Assistance

If you have questions regarding coolant compatibility for your specific BluePrint Engines application, contact BluePrint Engines Technical Support before filling or servicing the cooling system.