Buying a nearly 55-year-old truck and immediately driving it across the country is either a great adventure or a terrible idea. For Jeff Cleary and Ron, it turned out to be a little of both.

Jeff had wanted a 1972 Chevrolet Blazer for years. The reason was personal: his dad owned one when Jeff was a teenager, and it was one of the vehicles that helped spark his lifelong interest in cars.

As a kid, Jeff would move his dad’s Blazer around the driveway after work, supposedly so it would be backed into the garage and ready for the next morning. Before long, those driveway maneuvers became increasingly ambitious trips around the neighborhood.

His dad knew.

As Jeff remembers it, the response was simple: “Boy, if you’re gonna drive that thing around, put gas in it.”

Decades later, Jeff still wanted a ’72 of his own. Eventually, the right truck appeared on Facebook Marketplace—well outside his normal search radius. Jeff negotiated a price and called Ron.

The cross-country road trip they had talked about for years was officially on. The quest: an audacious California to Virgina road trip. The trek started in Alpine, about 30 miles east of San Diego and checkered flag dropped in Amelia, about 40 miles northeast of Richmond.

The Adventure Started Before the Engine Did

On paper, the Blazer had plenty going for it. It was a four-wheel-drive truck with a manual transmission, NP205 transfer case, and Dana 44 axle. It was simple, mechanical, and seemingly well suited to a long-distance adventure.

Then they tried to start it.

Nothing.

Fortunately, the first problem was also the easiest: the battery cable had been disconnected. With it reattached, the Blazer fired up and the trip could begin. After mounting new tires it was off to the open road.

It didn't take long for more serious problems to emerge.

The steering had enough play that Jeff compared driving the Blazer to piloting a sailboat—you had to make an input well before you wanted anything to happen. Then came an increasingly loud noise from the rear axle.

Inspection revealed badly worn pinion bearings. The Blazer had previously served as a snowplow truck, and its years of hard work were beginning to show.

A local driveline shop couldn't fit them into its schedule, but a nearby C10/K10 shop helped locate the bearings and seals they needed. The brakes presented another problem: the rear drums were so badly worn that replacements became another scavenger hunt.

They eventually found good used drums through a local Chevrolet truck enthusiast.

And then the fuel system started leaking.

Dry-rotted vent lines meant they couldn't safely fill the tank completely, reducing the Blazer's usable fuel capacity. Meanwhile, the odometer didn't work and the speedometer needle bounced around so violently that it wasn't useful for navigation.

Their solution was appropriately low-tech: GPS pins, calculated distances and frequent fuel stops.

The Blazer was averaging roughly 10.4 mpg.

Giving the Blazer a Modern Fuel and Ignition System

The plan had always included an important stop along the journey. Through Holley and Baer Brakes, Jeff and Ron had arranged garage space in Phoenix, Arizona where they could install a Holley Sniper EFI system and supporting ignition components.

Once the Blazer was inside, they got to work.

Explore Holley EFI Sniper 1 and Sniper 2 systems here.

Removing the existing HEI distributor presented one of the first challenges. Its large dimensions made firewall clearance difficult. The replacement Holley distributor's compact design made installation considerably easier in the tight space.

From there, the system began coming together quickly.

The complete Sniper fuel hose kit simplified routing the supply and return lines. Rather than fabricating an elaborate system, Jeff and Ron were able to route the hoses along the frame near the original fuel line and secure everything in place.

The ignition and EFI components were designed to work together, eliminating much of the wiring and splicing that can complicate retrofitting electronic fuel injection onto an older vehicle.

Then came the moment of truth.

They hit the key.

The engine barely made half a revolution before firing and settling into an idle.

After everything the Blazer had thrown at them up to that point, an easy win felt particularly good.

Tuning From the Driver's Seat

Getting the engine running was only part of what the upgrade brought to the trip.

Fuel quality became an issue as Jeff and Ron traveled through different areas. Under cruise and load, they occasionally heard detonation and needed to reduce ignition timing.

With the Sniper system, they could make those adjustments from inside the Blazer.

Instead of pulling over and mechanically adjusting the distributor, Jeff could reduce cruise timing while monitoring how the engine responded. Once the pinging disappeared, they knew they were back in a safer operating range.

That capability was particularly valuable when dealing with an unfamiliar engine, unknown gearing, and low-octane fuel.

And despite the Blazer's age—and everything they'd already repaired—the old truck wasn't exactly crawling across the country.

Jeff recalls seeing 93 mph while passing another vehicle.

“Smooth as butter.”

The Display Became Their Dashboard

One of the most unexpectedly useful pieces of the Sniper installation was its display.

Remember, this Blazer had started the trip with an unreliable speedometer and a nonfunctioning temperature gauge. Jeff had even packed an infrared temperature gun so they could periodically check that the engine wasn't overheating.

After the EFI installation, suddenly they had usable information.

The display gave them engine temperature, RPM and GPS-based vehicle speed. They checked the GPS speed against their phones and found it accurate.

For a truck whose factory instrumentation couldn't be trusted, the Sniper display effectively became their new dashboard.

“That thing turned out to be money,” Jeff said.

Making EFI Swaps Easier on Classic Trucks

After completing the installation on the road, Jeff came away with some practical advice for anyone considering EFI on an older car or truck, indicating one of the biggest considerations is the fuel tank.

Classic vehicles weren't designed around high-pressure electronic fuel injection, and packaging a suitable pump and fuel system can become one of the more difficult parts of the conversion. Starting with an aftermarket tank designed for EFI can simplify the project considerably.

Beyond that, Jeff found the complete system remarkably straightforward.

Using compatible Sniper, distributor and HyperSpark components meant the pieces interfaced cleanly rather than requiring extensive custom wiring. For an enthusiast doing the conversion at home, that integration can make a significant difference.

As Jeff and Ron put it: “If we can do it, anybody can do it.”

RetroBright Headlights Keep the Trip Going After Dark

EFI wasn't the only Holley upgrade that transformed the Blazer.

Jeff had also requested a set of Holley RetroBright LED headlights. He already had experience with RetroBrights on his 1969 Camaro and knew how much difference improved lighting could make on a classic vehicle.

The Blazer's original headlights made that upgrade particularly urgent.

Jeff and Ron described the factory lamps as being about as useful as “tea candles.” Even with proper charging-system voltage, the old lights were dim and yellow. The RetroBright installation was straightforward: plug them in, reinstall the retaining hardware and go.

The difference was immediate.

More importantly, the lights changed how they could use the truck. Jeff said they wouldn't have continued driving after dusk with the original headlights—particularly through dark desert stretches.

With the RetroBrights installed, nighttime driving became a realistic part of the trip.

From Marketplace Find to Usable Classic

The Blazer wasn't transformed into a pristine restoration. That wasn't the point.

It still looked and felt like the old truck Jeff had wanted in the first place. What changed was its usability.

It started reliably. It ran well. It had useful instrumentation. It could be driven at night. And after the mechanical repairs made along the journey, it stopped and drove the way a vehicle intended for regular use should.

For now, that's exactly how Jeff plans to keep it.

“The Blazer is good.”

After a cross-country shakedown involving failed bearings, worn-out brakes, leaking fuel lines, questionable gauges and a roadside hunt for decades-old Chevrolet parts, that's a pretty strong endorsement.

And the adventure may not be finished. Jeff and Ron are already talking about shorter road trips with their wives—and now they have a ’72 Blazer that's proven it can handle the distance.