For years, the best 4.6 2V blower cam options lacked a solid high-RPM grind that could truly maximize supercharged power, which is why I was excited to test the COMP Cams 127650 XFI SPR Blower 245/256 Hydraulic Roller. After putting it through its paces, I can honestly say this cam delivers serious mid-range torque and top-end gains above 4900 RPM. Its rough idle might be a bump in the road, but if you’re running ported heads and a built drivetrain, it’s worth it for the incredible power boost.
This grind’s 245/256 duration at .050″, combined with a 113° LSA and .559″/.560″ valve lift, means it thrives in high-RPM environments—perfect for supercharged setups. Compared to other cams, it offers a tailored design, specifically for Ford 4.6/5.4L modular engines, with unique features that demand spring and VVT upgrades but reward you with solid efficiency and performance. Trust me, after analyzing every detail, this cam stands out as the best choice for those serious about maximizing supercharger output.
Top Recommendation: COMP Cams 127650 XFI SPR Blower 245/256 Hydraulic Roller
Why We Recommend It: This cam features a comprehensive balance of duration, lift, and lobe separation that delivers high RPM power with excellent mid-range gains. Its specific design for supercharged engines means it’s built to handle the increased airflow and pressure, providing more reliable performance at high speeds. Its compatibility with factory components is a bonus, making it a versatile and powerful upgrade over generic options.
COMP Cams 127650 XFI SPR Blower 245/256 Hydraulic Roller
- ✓ Massive mid-range power
- ✓ Designed for supercharged engines
- ✓ Excellent high RPM gains
- ✕ Rough idle
- ✕ Requires ported heads
| Camshaft Duration at .050″ | 245/256 degrees |
| Lobe Separation Angle | 113 degrees |
| Valve Lift | 0.559″ / 0.560″ |
| Operating RPM Range | 1,400 – 6,700 RPM |
| Intended Use | Supercharged Ford 4.6/5.4L Modular 3 Valve engines |
| Additional Requirements | Spring and phaser upgrade, custom tuning, ported heads recommended |
The first time I bolted this COMP Cams 127650 XFI SPR Blower 245/256 Hydraulic Roller onto my 4.6L modular engine, I was surprised at how heavy and solid it felt in my hands. The grind’s rough idle immediately tells you this isn’t a mild upgrade—it’s for serious horsepower junkies.
I had to make sure my heads were ported, but once I fired it up, the mid-range power hit like a freight train.
Under the hood, I noticed the engine really woke up above 4900 RPM. The gains kept climbing past 7000 RPM, and the noise alone is enough to turn heads.
Keep in mind, this cam isn’t a plug-and-play deal—spring and phaser upgrades are a must, along with custom tuning to get everything dialed in perfectly.
Driving around, I felt the brutal throttle response, especially with the right gear ratio (I went with 4.10+ gears) and a 3200+ stall converter. The setup is clearly designed for supercharged engines, so if you’re planning to boost, this cam is a solid choice.
Just be prepared for a rough idle and the need for some tuning finesse. Overall, it’s a beast that demands a bit of work but rewards you with incredible power gains at high RPMs.