Early Bronco Radiator Mounts

Early Bronco Radiator Mount Guide: 3-Core vs 4-Core Fitment

If you own a 1966-77 Ford Bronco, chances are it’s been modified at least once in its lifetime. Early Broncos are easily one of the most customized classic 4x4s ever built, and one of the most common upgrades is swapping in a larger radiator. That’s where confusion often starts — especially when it comes to choosing the correct Early Bronco radiator mounts.

Our goal is simple: help you get the right radiator mounts the first time.

Why Radiator Mount Size Matters

Radiator mounts secure the radiator at the tanks, right where the upper and lower brackets cradle it. If the mounts are too narrow, the radiator won’t fit properly. Too wide, and it won’t be held securely. Proper fitment is critical for preventing vibration damage and ensuring long-term cooling system reliability.

The Key Measurement: Tank Width

The most accurate way to determine whether you need 3-core or 4-core radiator mounts is to measure the width of the radiator at the tanks — specifically where the mounts fit over them.

Here’s what we typically see:

• Stock V8 3-core radiator: Approximately 2.5 inches wide at the tank
• Most 4-core radiators: Approximately 3 inches wide at the tank

That half-inch difference is what determines whether you need standard 3-core mounts or the larger 4-core mounts.

What If Your Measurement Falls In Between?

If your radiator measures around 2.75 inches at the tank, it will usually fit within standard 3-core mounts. Our radiator mounts use rubber insulators that allow for slight variation in core thickness while providing proper cushioning and vibration control.

That rubber insulation is important. It helps absorb shock and protects the radiator from cracking or fatigue caused by engine movement and road vibration.

Don’t Rely on Core Count Alone

Some 4-core radiators will fit inside stock 3-core (V8) mounts — but most won’t. Core count alone does not guarantee mounting width. Different manufacturers build radiators with varying tank designs and dimensions.

The only reliable way to know is to measure.

Measure First, Order Once

Before ordering Early Bronco radiator mounts, grab a tape measure and check the tank width where the brackets install. A quick measurement can save time, prevent returns, and ensure your 1966-77 Ford Bronco radiator is mounted securely the first time.

Getting the right mounts means less hassle, better fitment, and a cooling system you can depend on.