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Featured Install
Nathan AirChime P3 544K Train Horn Kit
1978 Chevy K10 longbox
Sound Sample
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Nathan AirChime P3 1978 Chevy K10 Under-hood mount Graham White 353 150 PSI Square-body classic
1978 Chevy K10 Longbox Classic square-body.
Classic square-body.
Real Nathan P3 tone.
Under-hood install.
Nathan AirChime P3 544K + Graham White 353
Thomas M. recently upgraded his 1978 Chevy K10 longbox Stepside with the HornBlasters Nathan AirChime P3 544K Train Horn Kit, paired with a Graham White 353 Series manual train horn valve. He mounted the horns in a clean, accessible location under the hood so the truck keeps that classic square-body presence while delivering an attention-grabbing locomotive-style blast and straightforward service access.
The install shows how Nathan AirChime P3 hardware brings an iconic, powerful chord to a vintage Chevy, while the Graham White 353 adds precise manual control when you want to feather the horn instead of relying on a simple on/off tap. Thomas M.’s build is a strong example of blending classic K10 style with modern train horn performance. For other authentic Nathan systems, browse the Nathan AirChime collection on HornBlasters.
Under-the-hood packaging on a 1978 K10 is all about planning: hood swing, radiator and fan clearance, and keeping airlines away from moving parts and heat. This longbox Stepside keeps the Nathan bells where they can breathe and project while the kit’s onboard air support stays organized for the kind of installs enthusiasts actually maintain.
If you’re building a classic Chevy truck and want real AirChime tone—not a generic air horn impersonation—the P3 544K Train Horn Kit route paired with a quality manual valve is a proven recipe for sound quality and driver control.
- Nathan AirChime P3 544K Train Horn Kit: authentic P3 chord character with a complete HornBlasters onboard air solution
- Graham White 353 Series manual train horn valve: fine-grained, hands-on control over blast length and dynamics
- Under-hood placement: clean look and easier maintenance than buried frame-only layouts on this K10 longbox Stepside
- Classic square-body style: real Nathan tone for shows, cruise nights, or anytime you want the truck heard before it’s seen
- More Nathan options: explore the Nathan AirChime collection for comparable locomotive-grade systems
Shop the setup
Get the same setup
Includes
- Nathan AirChime P3 train horn
- 1NM Stealth Black compressor
- HornAir 5-gallon 8-port tank
- 110/150 PSI pressure switch
- 40-amp relay
- Black Widow 1/2" electric valve
- 17' of 1/2" DOT airline
- Brass NPT fittings kit
- Remote-mount air filter
- Complete wiring kit
- Mounting hardware
- Detailed instructions
The kit
Specifications
Nathan AirChime P3 544K Train Horn Kit Thomas’s 1978 Chevy K10 longbox Stepside runs the HK-P3-540 Nathan AirChime P3 with a HornAir 5-gallon tank, 1NM compressor, and a Graham White 353 Series manual valve upgrade for precise control.
150PSI Operating pressure
P3chord Nathan AirChime horn
½″NPT Horn air inlet
5gal HornAir air tank
| Kit | |
| Part number | HK-P3-540 |
| Operating pressure | 150 PSI |
| Restart pressure | 110 PSI |
| Voltage | 12-Volt DC |
| Horn | |
| Horn | Nathan AirChime P3 train horn |
| Horn length | 19.5" (495.3 mm) |
| Horn width | 15.5" (393.7 mm) |
| Horn height | 12.75" (323.85 mm) |
| Horn weight | 20.25 lb (514.35 Kg) |
| Horn air inlet | ½″ NPT |
| Air system | |
| Air tank | HornAir 5-gallon air tank |
| Tank length | 20.5″ (520.7 mm) |
| Tank diameter | 9.5″ (241.3 mm) |
| Tank height | 11.5″ (292.1 mm) (With Legs) |
| Tank weight | 20 lb (9.07 Kg) |
| Tank ports | x7 1/2" NPT, x1 3/4" NPT |
| Leader hose/check valve | 1/4" NPT |
| Max amperage | 25 Amps |
| Maximum duty cycle | 100% @ 100 PSI |
| Flow rate @ 0 PSI | 1.75 CFM |
| Compressor length | 10.75″ (273.05 mm) |
| Compressor width | 4″ (101.6 mm) |
| Compressor height | 6.75″ (171.45 mm) |
| Compressor weight | 10.1 lb (4.58 Kg) |
| Fill rates (5.0 gallon tank) | |
| 0 to 150 PSI | 6 min. 45 sec. (± 10 sec.) |
| 110 to 150 PSI | 2 min. (± 05 sec.) |
Frequently Asked Questions
What comes with the Nathan AirChime P3 544K Train Horn Kit?
The Nathan AirChime P3 544K Train Horn Kit is HornBlasters’ complete package for authentic P3 tone plus the onboard air system specified on the listing—horns, tank, compressor, lines, fittings, and wiring per the current product page. Thomas’s 1978 K10 build starts from that foundation, then layers in the Graham White 353 manual valve as a premium control upgrade. Always confirm the latest inclusions and PSI ratings before you buy.
Why use a Graham White 353 manual valve with a train horn kit?
Electric solenoids are convenient, but a Graham White 353 Series manual train horn valve lets the driver modulate airflow for short taps, long blasts, or anything between—exactly the precise manual control Thomas M. wanted on his K10. It’s a favorite upgrade for enthusiasts who treat the horn like an instrument. Install and plumb it per HornBlasters and Graham White guidance, and protect the circuit feeding any electric accessories you still run alongside it.
Can I mount Nathan P3 horns under the hood on a 1978 Chevy K10?
Yes—this featured truck does exactly that with the P3 544K bells placed for sound projection and service access. Every K10 differs by engine, accessories, and rust repairs, so you still need to verify hood closure, steering and brake booster clearance, and heat management before you drill. Nathan bells are heavy; use proper brackets, isolation, and Grade 8—or manufacturer-spec—hardware so nothing shifts on rough roads.
Is a Nathan AirChime kit overkill for a vintage half-ton?
“Overkill” depends on your goals. If you want the real locomotive chord that only Nathan AirChime geometry delivers, the P3 544K Train Horn Kit is the opposite of compromise—it’s the sound Thomas M. chased on his 1978 longbox Stepside. You do need to respect weight, electrical load, and local noise ordinances, but for show trucks and passionate owners, Nathan on a classic Chevy is the point.
Where can I compare other Nathan AirChime HornBlasters kits?
Start with the Nathan AirChime collection to compare bells, tank sizes, and compressors side by side. When you’re ready to spec the exact system for your truck, open the Nathan AirChime P3 544K Train Horn Kit product page for manuals, diagrams, and current pricing. Add the Graham White 353 manual valve if you want the same control upgrade featured here.
Show off your build
Running Nathan AirChime, Shocker, Outlaw, or another HornBlasters kit on your classic Chevy or GMC? We’d love to see it. Submit photos and details of your installation for a chance to be featured in our install gallery and inspire other square-body builders.
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