Best Camshafts for 5.7 & 6.1L HEMI (2003-2008 Guide)

A camshaft is the single most cost-effective way to wake up a 5.7 or 6.1L HEMI — no other bolt-on changes the engine's character and power curve as dramatically for the money. The right HEMI camshaft adds roughly 25–45 rear-wheel horsepower on a mild street setup and is the part that finally pushes a built 5.7 past the 400–450 RWHP wall that headers, intake and a tune alone cannot break. At our Tampa, FL shop we have cammed dozens of Rams, Chargers, 300Cs and SRT8s, and the same handful of COMP Cams grinds come up again and again. This guide compares the five best COMP Cams camshafts for the 2003–2008 Non-VVT 5.7 and 6.1L HEMI, with real lift, duration and lobe-separation numbers so you can match the cam to your goals.

Why the camshaft is the best bang-for-buck HEMI upgrade

The camshaft controls how far and how long the valves open, so it sets the engine's entire power personality. On the Gen III HEMI, the factory cam is tuned for fuel economy and quiet operation, which leaves a large amount of airflow on the table. A performance hydraulic-roller cam reshapes the powerband: more lift and duration move peak power higher in the rev range and add the aggressive idle that defines a built muscle car. On an engine-dyno test, a 5.7L HEMI jumped from 385 hp to 449 hp — a 65 hp peak gain and nearly 100 hp up high — from a cam swap alone. COMP advertises up to 54 hp from its entry-level HEMI grind.

There is one non-negotiable rule: every HEMI cam swap requires a custom tune. On 2003–2008 cars and trucks that means HP Tuners (or Diablo/SCT), and the tune does two jobs — it disables the factory MDS cylinder-deactivation so it can never collapse your new lifters, and it re-maps fuel and spark for the new cam. Budget for the tune up front; without it the engine will run poorly and you will see none of the gains below.

How we picked these HEMI camshafts

Every cam in this guide is a COMP Cams hydraulic-roller grind that bolts into the 2003–2008 Non-VVT 5.7 and 6.1L HEMI — the engine family found in the Ram 1500/2500/3500, Durango, Dakota, Chrysler 300C, Dodge Charger and Magnum R/T, Jeep Grand Cherokee and Commander, Chrysler Aspen, and the 6.1L SRT8 cars. We ranked them on measured power per dollar, idle character, whether they reuse the factory valve springs, and how complete the package is. Specs below are advertised duration at .050in lift, gross valve lift in inches, and lobe-separation angle (LSA) in degrees.

The 5 best camshafts for the 5.7 and 6.1L HEMI

1. COMP Cams Stage 2 Master Camshaft Kit — Best Overall

The Stage 2 Master Kit is the complete-package answer for a serious 5.7 or 6.1L HEMI build. The cam itself (part 112-303-11) is a 220°/230° @ .050in grind with .596in intake and .582in exhaust lift on a 113° LSA, and COMP calls it the best average power-and-torque cam of any sub-.600in-lift Gen III HEMI grind they have tested. Because that lift exceeds what factory valve springs can safely handle, the master kit (MK112-303-11) bundles matched COMP beehive springs (#26918), drop-in performance lifters, pushrods, steel retainers, locks, spring seats and valve seals — everything the valvetrain needs in one box. The non-MDS lifters also serve as the mechanical half of an MDS delete on 2005-and-up engines.

2. COMP Cams Stage 1 NSR Camshaft — Best Budget Drop-In

The Stage 1 NSR (part 112-300-11) is the cam to buy when you want a real power bump without touching the valve springs. It measures 216°/222° @ .050in with .500in intake and .495in exhaust lift on a 113° LSA, and the "NSR" designation — No Springs Required — is genuine here: COMP's Low Shock Technology lobe profile runs safely on the factory HEMI springs. That keeps install cost and complexity down, and the relatively mild grind preserves an OE-like idle, so it makes a great sleeper for a daily-driven Ram or 300C. COMP advertises up to 54 hp from this grind with supporting mods and a tune.

3. COMP Cams Stage 2 Camshaft (Cam Only) — Best Value Power

This is the exact 220°/230° @ .050in grind (.596in/.582in lift, 113° LSA, part 112-303-11) found inside the master kit, sold as the camshaft alone for $579.95. It is the smart buy if you already run upgraded beehive springs and good lifters — for example, on a HEMI that has already been into the valvetrain — because you skip paying for hardware you do not need. Just remember that this grind's .596in lift exceeds the safe limit of factory springs, so a spring upgrade is mandatory if your engine still has stock parts.

4. COMP Cams Thumpr NSR Camshaft — Best Sound

If the lopey, choppy muscle-car idle is the point, the Thumpr NSR (part 112-700-11) delivers it. It runs 214°/233° @ .050in with .495in/.492in lift, but the magic number is its 112° lobe-separation angle — tighter than the 113° or 114° of the other grinds, and tight LSA is exactly what produces that signature rough idle and exhaust note. Despite the attitude, it is a true No-Springs-Required cam that lives on the factory springs, so you get the sound on a budget. It is the choice for owners who want their 5.7 to announce itself at every stoplight.

5. COMP Cams CRH57 XFI 224/228 Camshaft — Best Street & Towing Torque

The CRH57 XFI (part 112-502-11) is built for broad, usable torque rather than a peaky top end, which makes it a favorite for HEMI Rams and Durangos that still tow. It runs 224°/228° @ .050in with .547in/.550in lift on a wide 114° LSA, operating from about 2,000 to 6,200 rpm. That extra duration over the Stage 1 cam fattens the mid-range while the wide LSA keeps the idle cleaner than the Thumpr, so it tows and cruises well and still pulls hard when you get on it. The .547in-plus lift means beehive springs are required.

What else you need for a HEMI cam swap

A camshaft is not a plug-and-play part, and skipping the supporting pieces is the most common way HEMI cam swaps go wrong. Plan for these before the cam ships:

• Custom tune (mandatory): 2003–2008 HEMIs are tuned with HP Tuners. The tune disables MDS and re-calibrates fuel and timing for the new cam — budget for it up front.
• MDS delete (2005+ with MDS): the factory cylinder-deactivation lifters are not compatible with aftermarket lobe profiles, so all 16 are swapped to non-MDS lifters (the Stage 2 Master Kit includes these). The 2003–2004 Rams and the 6.1L SRT8 have no MDS.
• Valve springs: Stage 1 NSR and Thumpr NSR run on stock springs; the higher-lift Stage 2 and XFI grinds require beehive springs. When in doubt, anything over roughly .550in lift wants a spring upgrade.
• Break-in: hydraulic roller cams need no flat-tappet ritual — no zinc break-in oil, no high-rpm hold. Prime the oil system, start, warm up and drive. A bottle of COMP Cams break-in lube on the lobes during assembly is cheap insurance.

Forced-induction builds are a special case: rather than a high-overlap NA grind, supercharged and turbo HEMIs should use the COMP Cams HRT Blower camshaft, which is profiled for boosted cylinder pressure.

How much horsepower does a HEMI cam add?

A cam swap is the upgrade that finally makes a HEMI feel built. On a naturally aspirated 5.7L, a mild cam plus a tune typically adds about 25–45 rear-wheel horsepower, and a cam paired with long-tube headers, an intake and ported heads commonly puts a 5.7 in the 440–450 RWHP range — figures that bolt-ons alone rarely reach. One documented engine-dyno test saw a 5.7 climb from 385 hp to 449 hp on the cam change alone. On the 6.1L SRT8, a mild cam on factory springs nets roughly 30–40 RWHP, and a heads-and-cam package can lift a 6.1 to the 470–475 RWHP zone. Because the 6.1's factory SRT8 exhaust manifolds already flow well, long-tube headers add only about 10–15 hp there. Every one of these numbers assumes a proper tune; without it, the cam can actually lose power.