A Detailed Cost Breakdown for Building a 350-HP Chevy Nova

Building a 350-horsepower Chevy Nova is a classic muscle car project that blends nostalgia with serious performance. Whether you’re aiming for a street-driven cruiser or a weekend strip warrior, reaching the 350 HP mark requires careful selection of engine components, performance parts, and skilled labor. This expanded guide breaks down the costs in detail, so you can budget accurately and avoid surprises. From the long block to the exhaust tips, we cover every major expense with real-world pricing and expert recommendations.

Overview: The Chevy Nova as a Performance Platform

The Chevy Nova, produced from 1962 through 1979, earned its reputation as a lightweight, affordable platform for high-horsepower builds. A 350 HP target is realistic and streetable, especially with a small-block Chevrolet (SBC) engine. Achieving that power typically involves a well-chosen camshaft, upgraded induction, and a free-flowing exhaust. While the original article provided a solid starting point, a comprehensive build demands deeper analysis of each subsystem.

Engine Costs: The Heart of the Build

The engine is where most of your budget will go. You have two paths: rebuild an existing 350 block or purchase a crate engine. We’ll examine both options and then break down the internal components.

Base Engine Choice: Rebuild vs. Crate

  • Rebuilding a Core 350: $2,500 – $4,000. This includes machining (bore, hone, deck, line bore), hot tank cleaning, new freeze plugs, and assembly. A used core generally costs $300–$600, but condition varies widely.
  • 350 Crate Engine (Factory or Aftermarket): $3,500 – $6,500. A GM Performance 350 HO crate (330 HP) runs about $4,200, while a BluePrint Engines 350 with 355 HP is around $4,900. These come with a warranty and are turnkey ready.

Which is more cost-effective for 350 HP? Rebuilding lets you choose every part, but machining adds up fast. A crate engine saves labor on assembly and often includes a cam and intake already matched. Many builders find a mid-range crate engine the better value, especially when labor costs are considered.

Rebuild Kit and Machine Work

  • Master Rebuild Kit: $500 – $1,000. Includes pistons, rings, bearings, gaskets, oil pump, timing set, and often a cam and lifters. Sealed Power and EngineTech are common brands.
  • Machine Work: $800 – $1,500. Boring and honing ($250–$400), decking the block ($150–$250), line honing mains ($200–$350), and balancing rotating assembly ($250–$500) are typical.

Unless you have a good core, factor in the possibility of a cracked block or damaged cylinder walls, which could push you toward a new block ($1,200–$1,800).

Performance Camshaft and Valvetrain

  • Hydraulic Flat Tappet Cam: $150 – $300. Comp Cams XE262 or XE268 are proven for 350 HP. Must include lifters ($80–$120).
  • Roller Cam (Retrofit): $400 – $800. Roller cams require roller lifters, pushrods, and often different valve springs. They reduce friction and allow more aggressive profiles.
  • Valve Springs, Retainers, Locks: $100 – $250. Necessary to handle cam lift.

A performance camshaft is arguably the single best upgrade for power. Budget $300–$600 for a quality flat tappet setup or up to $900 for a roller conversion.

Intake Manifold and Carburetor

  • Intake Manifold: $200 – $500. Edelbrock Performer (dual-plane) or Air-Gap (high rise) work well. Dual-plane for street, single-plane for high RPM. Expect $250 for an entry-level Performer.
  • Carburetor: $400 – $800. A 650–750 CFM vacuum secondary carb (Holley or Edelbrock) is ideal. Holley 750 Street Avenger runs about $500. For EFI conversion, expect $1,200–$2,000 (see Fuel System below).

Fuel System Upgrade

  • Mechanical Pump & Lines: $150 – $300. A high-flow mechanical pump (e.g., Carter M6903) and 3/8” steel line.
  • Electric Pump & Regulator: $300 – $700. Holley Red or Blue pump with regulator and return line.
  • EFI Conversion: $1,500 – $2,500. Throttle body EFI (FAST, Fitech) adds drivability but significantly increases cost.

For 350 HP, a mechanical pump with a good pressure regulator is sufficient, but an electric setup reduces vapor lock and supports future upgrades.

Performance Parts: Supporting the Horsepower

Once the engine is built, you need parts that let it breathe and stay cool. Cutting corners here can choke power or cause reliability issues.

Headers and Exhaust System

  • Headers: $400 – $800. Full-length headers with 1 5/8” primary tubes (e.g., Hooker Competition or Hedman) for street use. Ceramic coating adds $100–$200 but reduces underhood heat and rust.
  • Exhaust System: $300 – $600. A dual exhaust with H-pipe or X-pipe, mandrel-bent tubing, and performance mufflers (Magnaflow, Flowmaster). Do-it-yourself kits are cheaper; shop labor adds $200–$400.

Cheap shorty headers can restrict flow; invest in full-length if ground clearance allows.

Ignition System Upgrade

  • Distributor: $150 – $350. HEI from Summit Racing or MSD Ready-to-Run. An HEI is plug-and-play for most Novas.
  • Coil & Wires: $100 – $200. MSD Blaster coil, Taylor wires, and new spark plugs.
  • Ignition Controller (Optional): $200 – $400. MSD 6AL for rev limiting and improved spark.

A good ignition ensures complete combustion, especially with high-compression or nitrous applications. Budget $200–$450 total.

Cooling System

  • Radiator: $250 – $500. A three-row aluminum radiator (Champion, Mishimoto) is recommended. Factory brass radiators may not cool a 350 HP engine in hot weather or stop-and-go traffic.
  • Electric Fans & Shroud: $150 – $300. Dual 12” fans with a thermostatic controller.
  • Water Pump & Thermostat: $80 – $150. High-flow mechanical pump (FlowKooler) and 180° thermostat.

Overheating kills performance builds. Never skimp on cooling—add a separate transmission cooler if using an automatic.

Drivetrain Considerations (Bonus Section)

To handle 350 HP you may need upgrades beyond the engine itself:

  • Transmission: If using a stock Muncie, TH350, or Powerglide, a rebuild with a shift kit and heavy-duty clutches costs $500–$1,200. A Tremec TKO manual swap runs $2,500+.
  • Rear Axle: Stock 10-bolt may survive with careful driving, but a Chevy 12-bolt or Ford 9-inch swap costs $1,200–$2,500.
  • Suspension & Brakes: Upgraded leaf springs, shocks, and disc brakes (front) add $800–$2,000. Safety-critical at 350 HP.

These are often omitted from a simple “engine build” article but are essential for a usable car. Add at least $1,500 to the total if you plan to drive hard.

Labor Costs: Do It Yourself or Pay a Pro?

Labor rates vary from $75/hour (rural independent shops) to $150/hour (boutique performance shops). Major metropolitan areas see rates upward of $200/hour. The following estimates assume a competent shop.

  • Engine Removal & Installation: $1,000 – $2,000. Includes pulling old engine, cleaning engine bay, installing new mounts, and connecting all systems.
  • Engine Assembly (If Not Crate): $600 – $1,200. Some shops include this with machine work; standalone assembly is cheaper if you have a crate.
  • Performance Part Installation: $500 – $1,500. Headers, exhaust, carb tuning, wiring for electric fans, etc. A full exhaust installation alone can be $400–$800.
  • Dyno Tuning: $300 – $600. A proper chassis dyno tune optimizes air/fuel ratio, ignition timing, and overall power. Essential for fuel injection or radical cams.
  • Miscellaneous: $200 – $500. Fluids, coolant, oil, antifreeze, hoses, belts, and small hardware.

Total labor for a complete build: $2,500 – $5,800. If you do the work yourself, save $1,500–$3,000 but invest in tools (engine hoist, stand, torque wrench) that may cost $500–$800.

Total Cost Estimation: Low, Mid, and High Budgets

Combining all categories, here is a realistic range assuming no major surprises and a car that’s already in decent condition mechanically.

  • Budget Build (DIY, reused core, basic parts): $6,500 – $8,500
    • Rebuilt 350 with flat tappet cam, Edelbrock Performer, Holley 650, headers, dual exhaust, HEI, three-row radiator. No drivetrain upgrades.
  • Mid-Range Build (some shop labor, better parts): $9,000 – $12,000
    • Crate Ho 350, roller cam, upgraded fuel system, electric fans, trans shift kit, and basic suspension improvements.
  • High-End Build (full shop, EFI, drivetrain upgrades): $14,000 – $20,000+
    • Custom machined 350 with forged internals, roller cam, Holley EFI, full exhaust, 12-bolt rear, disc brakes, and track-ready tuning.

The original article’s “high-end” estimate of $12,000 is now a moderate figure once you include labor and supporting mods. A true turnkey 350 HP Nova with reliability often exceeds $15,000.

Factors That Significantly Influence Costs

  • Parts Quality and Brand: Cheap offshore parts can fail quickly. Stick to brands like Summit Racing, JEGS, Edelbrock, Holley, and Melling for reliability.
  • Location and Shop Expertise: A shop that specializes in vintage muscle cars may charge more but will do the job right the first time.
  • Vehicle Condition: Rust, broken bolts, and worn suspension mounts can double labor time. Expect $500–$1,500 in incidentals on an old Nova.
  • Emissions & Legal Compliance: If you need to pass smog (California, etc.), emissions-legal parts cost 20–50% more.
  • Custom Fabrication: Moving battery to trunk, custom wiring harness, or engine setback plates add $200–$1,000 each.

Tips to Save Money Without Sacrificing Quality

  • Buy used or take-offs: Check forums like Pro-Touring.com or Chevelle/Nova forums for deals on headers, intakes, and carburetors. Thoroughly inspect before buying.
  • Do the disassembly and prep work yourself: Remove old engine, clean engine bay, install wiring and hoses. This can save $1,000+ in labor.
  • Use a stock GM HEI distributor: It’s reliable and costs under $100 rebuilt. No need for aftermarket ignition until 400+ HP.
  • Choose a dual-plane intake: It provides good low-end torque and works with a broad range of cams. Avoid single-planes unless you rev past 6,500 RPM.

Conclusion: Plan for Reality, Not Just the Engine

Building a 350 HP Chevy Nova is an achievable and thoroughly enjoyable project, but the real cost goes far beyond the engine itself. A comprehensive budget should include supporting parts, drivetrain upgrades, labor, and a healthy contingency for surprises. Whether you go with a well-matched crate engine or a machined block with a hot cam, the key is to prioritize parts that work together. When done right, a 350 HP Nova delivers the classic muscle car experience without the headaches of an unreliable build. Use the figures in this article as your baseline, adjust for your region and skill level, and start hunting for parts. The result will be worth every penny.

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Note: Prices are estimates as of 2025 and vary by region, availability, and market fluctuations. Always get current quotes from multiple suppliers.