Installing a Mopar 360 kit is one of the most popular and effective ways to wake up a classic Mopar small-block—whether it’s a 1970s police-package cruiser, a restomodded Duster, or a weekend bracket racer. The 360 cubic-inch engine, part of Chrysler’s LA and later Magnum families, responds exceptionally well to a well-matched performance package. But knowing what to expect in terms of cost, labor, and real-world gains can be the difference between a satisfying build and a money pit. This article breaks down the finances, the performance results, and the installation details you need before pulling the trigger.

What Is a Mopar 360 Kit?

The term "Mopar 360 kit" can refer to a range of aftermarket packages, but most commonly it means a top-end kit that replaces the intake manifold, carburetor, carburetor spacer, camshaft, lifters, pushrods, valve springs, timing chain set, and headers. Some kits also include an aluminum cylinder head or a complete rotating assembly, but the typical street-performance kit focuses on the induction and valvetrain. These kits are engineered to work together as a system, so you get a proven combination that avoids the guesswork of mixing and matching parts from different brands.

There are two main generations of the 360 to consider: the LA-style (1971–1992) and the Magnum-style (1993–2003). Most aftermarket kits are designed for the LA-block, but adapters and conversion parts exist for Magnum heads and intakes. Make sure you know which engine family you have before ordering. The kit usually targets a power range of 300–400 horsepower, with a strong emphasis on low-end torque—exactly what you want for street driving or towing.

Cost Breakdown: What You’ll Really Spend

A realistic budget for a Mopar 360 kit installation goes well beyond the price of the parts box. Here’s a line-item breakdown based on typical 2024 pricing and a do-it-yourself (DIY) approach versus shop labor. All prices are in US dollars.

Kit Component Pricing

  • Mopar Performance P5249396 (or equivalent kit): $1,600–$2,200. This includes an Edelbrock Performer RPM intake, a 750 CFM carburetor, a hydraulic camshaft (roughly 0.480" lift, 230° duration), dual springs, timing set, and lifters. Some bundles drop the headers and add a distributor.
  • Headers: $250–$600 for a set of 1⅝” primary tube long-tube headers for an A-body or B-body chassis. Ceramic coating adds $150–$250.
  • Gasket set: $60–$120 for a Fel-Pro performance head gasket and intake/exhaust gaskets.
  • Spark plugs and wires: $80–$150 for copper-core plugs and a good set of 8mm silicone wires.
  • Fluids and filters: $50–$100 for oil, antifreeze, and a new fuel filter.
  • Carburetor tuning parts: $20–$60 for jets, rods, and a vacuum gauge.

Machine Work and Special Tools

  • Valve job on existing heads (if not new): $250–$500. The kit springs may require a cut for install height.
  • Head resurfacing: $50–$100 per head.
  • Balancing and blueprinting of rotating assembly (if doing a full rebuild): $400–$800.
  • Dial indicator and degree wheel: $80–$120 if you don’t own these tools for cam timing verification.

Labor Costs (If You Hire a Shop)

  • Top-end tear-down and re-assembly: $800–$1,500 for a reputable performance-focused shop. Rushing the job often leads to problems.
  • Machine work labor (valve job etc.): Already listed above, but some shops charge $200–$400 extra for removal and reinstallation of heads.
  • Dyno tuning: $300–$600 for a full session. This is not optional if you want the kit to run correctly and avoid detonation or lean misfires.
  • Miscellaneous charges (carburetor calibration, timing adjustment, base gasket replacement): $100–$250.

Total estimated cost for a DIY installation: $2,200–$3,500 (including dyno time if you pay for it). Total for shop installation: $3,200–$5,500+. The higher end of the range includes new heads or a performance distributor upgrade.

Performance Expectations: Horsepower, Torque, and Driveability

When installed correctly and tuned on a dyno, a typical Mopar 360 top-end kit delivers the following gains over a stock 2-barrel or low-compression 4-barrel engine:

  • Peak horsepower increase: 60–110 hp. Expect 350–380 hp at the flywheel on a 9.0:1 compression 360 with a mild cam and stock heads. With heads and a more aggressive cam, 400–420 hp is achievable on pump gas.
  • Peak torque increase: 80–120 lb-ft. Torque in the 350–420 lb-ft range, peaking around 3,500–4,000 rpm.
  • Broad powerband: The hydraulic roller cams in many kits pull strongly from 2,000 rpm to 5,500 rpm, perfect for street driving with an automatic transmission and 3.23–3.55 gears.
  • Idle quality: Expect a noticeable lope at idle (around 750 rpm) but not so rough that it stalls at stoplights. You’ll need a strong base timing of 14–18° BTDC and a vacuum advance distributor tuned for total timing of 34–36°.
  • Fuel economy: Surprising as it sounds, a properly tuned 360 with a performance kit can match or beat the original 2-barrel mileage on the highway (15–18 mpg) because the improved combustion efficiency and larger intake let the engine run leaner at cruise. Around town, expect 10–13 mpg depending on your right foot.

Real-world quarter-mile times for a 3,500-lb car (like a Dart or Duster) with a 360 kit, headers, and 3.55 gears typically fall in the low-13s to mid-12s at 105–110 mph. That’s a solid mid-12-second street car on pump gas.

Important Caveats

  • Compression ratio matters. If your 360 has dished pistons (common on late-70s smog engines), you may end up with only 8.5:1 static compression. This will reduce the peak numbers by 20–30 hp.
  • Exhaust system limitations: If you keep restrictive factory manifolds or a single 2.25” exhaust, you will choke the kit. A free-flowing 2.5” or 3” dual exhaust is mandatory.
  • Transmission and torque converter: A stock 904 or 727 with a stall converter of 2,200–2,800 rpm is ideal. A stock stall (1,800 rpm) will feel sluggish off the line.

Installation Process: Step-by-Step Technical Overview

This overview assumes you’re starting with a running engine and performing a top-end swap. If your engine needs a rebuild, factor in additional time and cost.

1. Preparation and Disassembly

Gather all tools: socket set, torque wrench (ft-lb and inch-lb), harmonic balancer puller, distributor tool, and a quality degree wheel. Drain coolant and remove the radiator, fan, and shroud for access. Disconnect battery negative. Remove the air cleaner, carburetor, and fuel line. Unbolt the distributor and mark its position (or better, use a wire tie to the number 1 spark plug wire location). Remove the intake manifold bolts in reverse tightening sequence. Lift off the intake manifold. Clean the valley and engine block sealing surfaces with a razor blade and brake cleaner. Remove the rocker arms, pushrods, and lifters (keep them in order if reusing, but you’ll replace them with the kit). Remove the timing cover, water pump, harmonic balancer, and timing chain. Clean the front of the block.

2. Camshaft Installation

Coat the cam lobes thoroughly with camshaft break-in lubricant (use a thick paste). Install the cam gently into the block—never force it. Reinstall the timing chain with the marks aligned at TOP DEAD CENTER (TDC) of #1 piston. Set the timing chain tension (usually a ¼-turn preload on the cam bolt). Verify the cam grind’s recommended installed intake centerline using a degree wheel. This step catches dozens of mistakes. Reinstall the timing cover with a new gasket and seal, then the water pump and balancer.

3. Valve Springs and Head Preparation

If your cylinder heads are iron LA-style, remove them and bring them to a machine shop for a valve job and to set the spring installed height to the kit’s specifications. Do not simply swap springs—they may bind or cause coil-bind on your valve seals. Use a spring height micrometer and shim as needed. Reinstall heads with new head gaskets (blue Fel-Pros recommended) and torque in three stages to 95–105 ft-lb (depending on gasket type). Reinstall the rocker shafts with new pushrods. Adjust valve lash (if solid) or rocker arm preload (hydraulic) to manufacturer spec.

4. Intake Manifold and Carburetor

Apply a thin bead of RTV at the valley seam (block-to-intake interface). Install the new intake manifold with its gasket set, torquing in sequence: start at the center and work outward in 15 ft-lb increments to 30–35 ft-lb (per Edelbrock spec). Install the carburetor spacer and new carburetor. Connect the throttle linkage and kickdown cable (if automatic—critical for proper transmission operation). Install new fuel line and filter. Reinstall the distributor with the rotor pointing at #1 terminal. Set initial timing to 16° BTDC and total to 36° by 3,000 rpm. Tighten distributor hold-down.

5. Final Assembly and First Start

Fill with oil (10W-30 with zinc additive or diesel oil to protect flat-tappet cam—most kits now use hydraulic roller, but verify). Ensure there is no vacuum leaks. Fill coolant. Double-check all bolts: motor mounts, transmission, alternator, and belt tension. For the first start, prime the oil system by cranking with the distributor out until oil pressure registers, then install the distributor. Start the engine and run at 2,000–2,500 rpm for 20 minutes to break in the cam (if flat-tappet). Do not let it idle—idle is the worst thing for a new cam. After break-in, adjust idle mixture screws and set idle speed to 750–850 rpm in park. Check for leaks.

6. Dyno Tuning and Road Testing

A chassis dyno session is worth every penny. You’ll fine-tune the air/fuel ratio, total timing, and vacuum advance curve. Expect to pay $350–$500 for a half-day. After dyno, do a road test for acceleration, part-throttle response, and transmission shift quality. Make small jet changes as needed.

Common Pitfalls to Avoid

  • Using the wrong cam degree: Ignoring the degree wheel causes the cam to be advanced or retarded, costing 20–40 hp.
  • Inadequate fuel delivery: Stock 5/16” fuel lines and old rubber lines collapse under high flow. Upgrade to 3/8” line and an electric fuel pump if you’re pushing over 400 hp.
  • Ignition upgrades ignored: A stock points distributor with a performance cam and 750 cfm carb is a mismatch. Use an electronic ignition (Mopar Mopar Performance or MSD) with a coil capable of 40,000V+.
  • Overlooking exhaust: 2.25” pipes with a crossover are restrictive. 2.5” or 3” with an X-pipe and chambered mufflers (like Dynomax) will unlock 10–15 hp.
  • Forgetting the transmission: A 360 kit that makes 380 hp will smoke a stock 904 transmission’s clutch packs within a few thousand miles. Upgrade to a performance rebuild with a shift kit and a higher stall converter (2,400–2,800 rpm).
  • No break-in oil for flat-tappet cams: If you have an older kit with a flat-tappet cam, use a dedicated break-in oil with high zinc (like Joe Gibbs BR30) for the first 500 miles.

Choosing the Right Mopar 360 Kit for Your Build

Several manufacturers offer complete top-end kits for the 360. The most popular are:

  • Mopar Performance P5249396 (the classic “Mopar Performance” kit): A proven combination for LA engines. Includes Edelbrock Performer RPM intake, 750 cfm Edelbrock carb, Mopar cam and lifters. Good for 350–380 hp.
  • Edelbrock Total Power Package (TCP) for Chrysler 360: Includes Edelbrock RPM intake, Performer Series 600 or 750 carb, and Performer RPM cam kit. Slightly milder than Mopar’s, with better street manners.
  • BluePrint Engines pre-assembled kits: Often come with aluminum heads, making power easier but increasing cost to $3,000+.

For Magnum engines, look for a kit that specifies “Magnum intake” or use a LA-to-Magnum adapter plate (about $100). Consider a fuel injection upgrade (e.g., FITech or Holley Sniper) for better drivability—those kits cost $800–$1,200 but eliminate carb tuning and improve cold starts.

Final Considerations

A Mopar 360 kit is an excellent investment for a street-driven Mopar, providing a big leap in acceleration and throttle response without the complexity of an engine swap. The key to a successful build is proper component matching—don’t guess when it comes to cam timing, ignition curve, or fuel delivery. Spend the money on a professional dyno tune and a quality torque converter; those two items alone can mean the difference between a 13-second car and an 11-second car. For more detailed specifications, check the Mopar Performance catalog at Mopar.com or your local dealer. For real-world build stories and troubleshooting, forums like For A Bodies Only are invaluable. And if you’re sourcing parts, Summit Racing carries nearly every component listed here with detailed customer reviews. Plan your budget, follow the instructions, and enjoy the roar of a properly built 360.