How much horsepower can you get out of a 4.7 magnum?
The 4.7 Magnum V8 typically produces about 235 to 265 horsepower in stock form, depending on the year and variant. With common performance tweaks you can push into the high 200s, and with more aggressive setups such as forced induction, you can reach well into the 400s under the right conditions.
Understanding the 4.7 Magnum
The 4.7L PowerTech engine, widely used in Jeeps and Dodges from the late 1990s onward, has evolved through several variants. The base configuration is known for solid low-end torque and reliable mid-range power, while later updates added modest power increases and, in some markets, features like variable valve timing. The exact horsepower depends on the specific model year and configuration installed in the vehicle.
Stock horsepower by variant and year
The following figures are representative of common 4.7 Magnum configurations. Exact numbers can vary by market and year, so check your vehicle’s official spec for precise ratings.
- 4.7 PowerTech (early, non‑HO versions): approximately 235 hp
- 4.7 High Output (HO) variants: approximately 265 hp
- Late‑production or updated variants with modern calibration (e.g., VVT-equipped): typically around 270–300 hp
These figures illustrate typical stock ratings across common configurations. Individual vehicles may show slight deviations based on emissions equipment, tuning, and regional specifications.
Performance tuning options and realistic outcomes
Modifying a 4.7 Magnum can yield meaningful horsepower gains, but the extent depends on how far you’re willing to go and how much you invest in supporting systems such as cooling and fuel delivery.
- Bolt-on upgrades (air intake, exhaust, and ECU tuning): generally +15 to +40 hp
- Headers with a high‑flow exhaust and a proper tune: roughly +30 to +70 hp
- Camshaft and valve-train upgrades (where available for the 4.7): roughly +20 to +50 hp
- Forced induction (supercharger or turbocharger) and supporting modifications: typically +150 to 250+ hp, depending on the kit and fueling/cooling upgrades; outcomes vary widely by setup
In practical terms, bolt-ons and exhaust/intake upgrades can yield noticeable improvements without overhauling the drivetrain, while forced‑induction routes offer the potential for substantial gains but require careful tuning and robust supporting upgrades to maintain reliability.
What to consider before modifying
Before chasing higher horsepower, consider the durability of the stock bottom end, cooling capacity, transmission compatibility, and fueling strategy. The 4.7 Magnum is not as widely supported as some newer platforms, so availability of high‑quality aftermarket parts and professional tuning can influence both cost and reliability.
Bottom line
For most users, the practical ceiling of a 4.7 Magnum in stock form sits around 235–265 hp. With well-planned bolt-ons, you can reach roughly the high‑200s. For serious power, a forced‑induction route is possible, but it demands careful engineering and a willingness to invest in supporting systems to keep reliability intact.
Summary
The 4.7 Magnum’s stock horsepower typically ranges from the mid-200s, with HO variants nudging higher. A thoughtful combination of intake, exhaust, and tuning can push outputs into the high 200s, while forced induction can push well beyond 400 hp with the right build. Always verify exact specs for your vehicle and consult professionals when planning significant power upgrades.
