Description
Heavy Duty Diesel Series | Cummins
ISX11.9/12 / ISX15 / ISX Complete Valve Set: 12 Intake + 12 Exhaust
OE-Grade Valve Set
The factory-correct alloy pairing: EN52 intakes for hardness and wear resistance, 21-4N exhausts for hot strength where the heat lives. A straight OE-spec rebuild set without the OE price tag.
| 24Valves | EN52 / 21-4NAlloy | 1.870"Intake Head | 1.790"Exhaust Head |
Kit contents: (12) intake valves + (12) exhaust valves
Why Builders Choose This Set
- EN52 chrome-silicon martensitic stainless: hard, wear resistant, the OE-standard intake alloy (rated ~1,400°F).
- 21-4N austenitic stainless: high hot strength and corrosion resistance, the OE-standard heavy-duty exhaust alloy.
- Manufacturer-inspected, 100% metallurgical inspection: XRF alloy verification, Rockwell hardness and dimensional check on every batch
- Complete engine set: 12 intake + 12 exhaust, nothing extra to source
Fitment
| Make | Engine |
|---|---|
| Cummins | 11.9 Liter (726 CI) L6 24Valve ISX11.9/12 Turbo Diesel |
| Cummins | 14.9 Liter (912 CI) L6 24Valve ISX15, QSX15 Turbo Diesel |
| Cummins | 15.0 Liter (915 CI) L6 24Valve ISX, QSX Turbo Diesel |
Intake Valve Specs
| Head Diameter | 1.870″ |
|---|---|
| Stem Diameter | .3789″ |
| Overall Length | 8.503″ |
| Seat Angle | 20° |
| Grooves | 1 |
| Tip Length | .4669″ |
| Material | EN52 Stainless Steel |
| Nominal Stem | 3/8 |
Exhaust Valve Specs
| Head Diameter | 1.790″ |
|---|---|
| Stem Diameter | .3789″ |
| Overall Length | 8.810″ |
| Seat Angle | 45° |
| Grooves | 1 |
| Tip Length | .7579″ |
| Material | 21-4N Stainless Steel |
| Nominal Stem | 3/8 |
OE Interchange
Intake:
Cummins# 3680760 , 4059216 , 4059326 , 4965868
Cummins# 3680760 , 4059216 , 4059326 , 4965868
Exhaust:
Cummins# 3680759 , 4059327 , 4101454
Application & Installation
Verify head diameter, stem diameter, overall length and groove style against your old valves before installation. Years vary by application. Check guide wear and seat condition during assembly; new valves in worn guides will not last. Professional machine work is recommended.
90-Day Limited Parts Warranty
Covered for the original purchaser against defects in materials and workmanship for 90 days from purchase. Remedy is limited to repair, replacement, or credit at our discretion. Labor, installation, removal, shipping, consequential damage, racing or competition use, misuse, alteration, improper installation, and normal wear are excluded. See our full Warranty Policy. Questions? Call 727-609-1700.
