Boss 302 · Restoration Cost

Boss 302 Mustang restoration cost — the Cleveland head premium, and why authentication comes first.

Researched by Dorian — owner of a 1967 fastback, no parts to sell. Real shop rates, real parts costs, and the honest number on what it takes to restore a Boss 302 correctly versus what it costs to approximate one.

Pricing reviewed by Dorian · April 2026

The short answer

A driver-quality Boss 302 restoration runs $22,000–$85,000 all-in — close to a standard 302 Mustang at the same scope because engine provenance matters less when you are driving it. A show-quality build lands $85,000–$230,000 with the Boss 302 premium baked in. Concours starts at $130,000 and can exceed $400,000 for a full matching-numbers car with all date-coded components verified.

The Boss 302 premium over a standard Mustang build is $8,000–$40,000 depending on scope. At driver scope the premium is small — you are paying for a correct-era engine rebuild, not necessarily a date-coded concours restoration. At show and concours scope the premium is real: correct Cleveland head castings, a verified Holley 780 CFM carburetor with the right list number, and engine stampings that match the VIN add significant cost to the engine category alone. Authentication comes before parts. A Marti Report and engine stamping verification before you spend a dollar on restoration is not optional.

— Dorian, owner & restorer

The engine

The Cleveland head Windsor block — what makes it expensive to rebuild correctly

The Boss 302 used a 302ci Windsor block fitted with large-port heads derived from the new Cleveland engine family — a combination that exists nowhere else in Ford's production lineup. The result was a high-revving, race-proven engine that dominated SCCA Trans-Am competition in 1969 and 1970. It also created a restoration complication: rebuilding it correctly requires a specialist who understands both Windsor short-block dimensions and Cleveland head characteristics. A shop that handles standard 302 rebuilds every day may not have that expertise.

The correct 1969 heads carry casting number C9OE-6090-B. The 1970 heads use D0OE castings — revised for improved flow and cooling. Both sets require the correct solid-lifter camshaft, adjustable rocker arms, and the matching Holley 780 CFM carburetor (list number 4801 for 1969 cars). At concours scope, every one of those components needs a date code that precedes the car's build date by no more than 90 days. Finding correctly dated components in the market takes time and money.

Driver-scope engine rebuild: $4,500–$8,500

At driver scope, a correct-era 302 with the right heads gets you a reliable, authentic driver without the concours premium. The engine does not need date-coded components — it needs to run correctly and look honest. A good shop familiar with Boss 302 builds can deliver this for standard engine rebuild pricing. If the matching engine is missing, a correct-displacement 302 with period-correct Cleveland heads is the right substitute.

Show-scope engine rebuild: $10,000–$20,000

Show scope requires correct head castings, correct carburetor list number, correct ignition, and correct valve covers. The engine does not necessarily need a verified matching VIN stamp — show classes vary on this — but all external components visible to a judge need to be correct-spec. Budget $2,000–$4,000 above a standard 302 show-scope rebuild for the Boss-specific components and specialist labor.

Concours engine rebuild: $14,000–$25,000

A correct concours Boss 302 rebuild accounts for a significant portion of the scope premium. Every component visible and verifiable — heads, carburetor, cam, distributor, alternator, wiring looms — carries a date code. A specialist who knows Boss 302 authentication will charge accordingly. Get a clear scope of work in writing before the engine leaves the car. Budget 12–18 months for engine work alone at a respected shop.

Authentication first

Marti Report and engine stampings — do this before you spend anything else

The Boss 302 clone problem is real. Because the car commands a significant premium over a standard Mustang, there are incentives to build a convincing replica. A Boss 302 data plate (engine code G on the cowl tag) can be sourced from a parts car and transplanted. The engine stampings cannot be faked without obvious evidence. Before committing to a show or concours restoration, spend $50–$100 on a Marti Report and physically verify the engine block stampings.

Authentication checklist

Marti Report: confirms factory engine code (G), body color, transmission, and options. Available for 1967–1973 cars only. $50 digital, $100 printed. Non-negotiable.
Engine block stampings: passenger-side front of block, near the oil filter. Prefix 9F (1969) or 0F (1970), followed by plant code R (Dearborn), then the last six VIN digits. Matching = original engine.
Cowl tag (data plate): DSO field, axle code, transmission code, and paint code. Verify against Marti Report — they should corroborate.
Head casting numbers: C9OE-6090-B for 1969, D0OE for 1970. Wrong castings on a claimed Boss 302 are a red flag worth investigating before purchase.
Transmission: Boss 302 was factory-installed with the close-ratio Toploader 4-speed only — no automatic transmission option existed. An automatic transmission in a claimed Boss 302 is wrong.

Authentication applies at purchase, not just at show registration. A clone discovered mid-restoration is an expensive problem — you either accept a lower-value build or source a matching engine, which can cost $20,000–$50,000+ if the original is gone.

1969 vs 1970

1969 Boss 302 vs 1970 — where the cost differences are

The 1969 and 1970 Boss 302 restorations are similar in scope and cost for mechanical work. Ford refined the car for 1970 — improved cooling, revised cam profile, better oiling — but the rebuild process and pricing are comparable year-to-year. The meaningful cost differences are in paint, decals, and front-end sheetmetal.

1969 Boss 302: wider color palette, deeper decal reference pool

The 1969 Boss 302 was available in a wide range of colors including Bright Yellow, Calypso Coral, Acapulco Blue, Wimbledon White, and others. The decal specification pool is well-documented at this point — there are enough 1969 show cars that dimensional accuracy of reproduction stripe kits can be cross-referenced. The 1969 front clip is also better supported by the aftermarket than the 1970-specific nose.

1970 Boss 302: Grabber colors, tighter decal sourcing, front clip premium

The 1970 Boss 302 was offered primarily in Grabber Blue, Grabber Green, Grabber Orange, and Calypso Coral — the Grabber palette that defined the final year. Sourcing dimensionally accurate 1970 Boss 302 stripe and decal kits adds $1,500–$3,000 at show scope compared to the 1969 equivalent. The 1970 also carries the front clip cost variable — the revised 1970-specific header panel, valance, and grille do not interchange with 1969 parts and cost 20–40% more than equivalent 1967–68 sheetmetal.

All four scope tiers

Cost breakdown by scope — Boss 302 all-in ranges

Base costs use the standard 1969–1970 SportsRoof fastback at fair condition. The Boss 302 premium column is additive — it represents the incremental cost of correct Boss 302 components and authentication above a standard 302 Mustang build at the same scope.

Scope

What it means

All-in range

Boss premium

Driver

Functional driver with a correct-era 302. Engine provenance matters less at this scope.

$22K–$85K

$3K–$8K

Restomod

Factory appearance with modern suspension and interior. Correct Boss engine appreciated.

$70K–$200K

$5K–$12K

Show

Correct Cleveland heads, correct Holley, correct stampings, correct colors. Judge-ready.

$85K–$230K

$8K–$20K

Concours

Date-coded everything. Verified stampings. Factory documentation. Matching numbers required.

$130K–$430K

$15K–$40K

All-in ranges include 15–25% contingency. National average shop rates (~$125/hr). Run the 1969 estimator or 1970 estimator for Low/Mid/High across all 9 categories and add the Boss 302 premium for your scope.

Category breakdown

Driver-quality cost by category — Boss 302 base

These numbers represent a driver-quality Boss 302 using the standard estimator categories. At driver scope the Boss 302 premium over a standard 302 car is modest — the engine category picks up the Boss-specific rebuild cost and everything else is the same platform.

Where Boss 302 restorations get expensive fast

Four areas consistently generate surprise costs on Boss 302 restorations — all of them avoidable with upfront verification.

Wrong head castings discovered mid-build. A shop that begins a Boss 302 engine rebuild without first verifying head casting numbers can spend $3,000–$6,000 in machine work on the wrong heads before anyone notices. Verify C9OE-6090-B (1969) or D0OE (1970) before the engine leaves the car. If the castings are wrong, source correct ones before disassembly — not after.
Toploader transmission sourcing. The Boss 302 was factory-installed with a close-ratio Toploader 4-speed — no exceptions. A correct-ratio Toploader with original stampings runs $3,500–$7,000 in the current market. A rebuilt unit with correct ratios but non-matching stampings is appropriate for driver and restomod scope but will fail a concours transmission inspection. Know which level you are building to before you source the gearbox.
Decal and stripe sourcing at show scope. The Boss 302 C-stripe is one of the most identifiable graphics in Mustang history and one of the most commonly reproduced incorrectly. Dimensional accuracy varies significantly across vendors. At show scope, budget time for sample comparison and verification against documented reference cars before ordering. A set of incorrect stripes discovered after paint means stripping and repainting — the most expensive mistake in any show-quality build.
Clone discovery after purchase. Discovering mid-restoration that the car is a clone — data plate transplant, non-matching engine, or a standard Mustang converted to Boss trim — can cost $20,000–$50,000+ to remedy if you want a genuine matching-numbers car. It is cheaper to verify before purchase than to correct after. A Marti Report and engine stamping check is a $50–$100 investment that can save five figures.

Run your own numbers

Use the free Mustang cost estimator

Pick your year, body style, condition, and scope — the estimator returns Low/Mid/High across all 9 cost categories with contingency included. Add the Boss 302 premium for your scope on top of the engine category result. No email, no gate, no agenda.

1969 Boss 302 estimator → 1970 Boss 302 estimator →

Results visible instantly. See also: full restoration cost guide.

Frequently asked

Boss 302 restoration cost — common questions

How much does a Boss 302 Mustang restoration cost?

A Boss 302 Mustang restoration costs between $25,000 and $400,000+ depending on scope, starting from a driver-quality build using a correct-era replacement engine up to a full concours restoration with verified date-coded components and matching stampings. The Boss 302 premium over a standard 302 Mustang ranges from $3,000–$8,000 at driver scope (where engine provenance matters less) to $15,000–$40,000 at show and concours scope where correct Cleveland head castings, date-coded carburetor and ignition components, correct Toploader transmission stampings, and factory color documentation are all judged. Authentication with a Marti Report and physical engine stamping verification is mandatory before investing in a show or concours build.

What makes the Boss 302 engine expensive to restore correctly?

The Boss 302 used a 302ci Windsor block fitted with large-port Cleveland-style heads — a combination unique to this engine. The correct 1969 heads carry casting number C9OE-6090-B; the 1970 heads use D0OE castings. These heads require a specialist who understands both Windsor short-block and Cleveland head geometry — a standard 302 rebuild shop may not have the expertise. A correct concours engine rebuild runs $14,000–$25,000 for the Boss 302 compared to $4,500–$8,500 for a standard 302. The Boss 302 also requires the correct solid-lifter camshaft, adjustable rocker arms, and the Holley 780 CFM carburetor (list number 4801 for 1969). All components should be date-coded to precede the car's build date by no more than 90 days for correct concours presentation.

How do I verify a Boss 302 is genuine?

Start with a Marti Report ($50–$100 from martiautoresearch.com) — it confirms factory options, body color, and drivetrain codes from Ford's original production records. A genuine Boss 302 will show engine code G (302-4V high-performance) on the data plate. Then verify the engine stampings: the Boss 302 block carries a partial VIN stamp on the passenger-side front of the block near the oil filter. The stamp prefix for 1969 cars is 9F, for 1970 it is 0F, followed by the plant code (R for Dearborn) and the last six digits of the VIN. Matching stampings confirm the original engine is still in the car. A car with a Boss 302 data plate but a mismatched block is a numbers-replacement car — legitimate, but priced differently than a matching-numbers example.

What is the difference between 1969 and 1970 Boss 302 restoration costs?

Mechanically, the 1969 and 1970 Boss 302 restorations cost nearly the same for engine work. The 1970 made several refinements — improved cooling, a revised cam profile, and better oil management — that addressed the 1969's known issues, but the core rebuild process and cost are comparable. The cost difference at show scope is in paint and decals. The 1970 was offered exclusively in Grabber Blue, Grabber Green, Grabber Orange, Calypso Coral, and a handful of standard colors. Sourcing dimensionally correct 1970 Boss 302 stripe and decal kits from specialist vendors adds $1,500–$3,000 over the 1969 equivalent. The 1969 has more color variety and a deeper pool of show participants to cross-reference decal specifications against.

How long does a Boss 302 restoration take?

Driver-quality Boss 302 restorations take 12–24 months, similar to any 1969–1970 Mustang at that scope. Show-quality restorations run 2–4 years when correct component sourcing is factored in — finding date-coded Cleveland heads, a correct-spec Holley 780, and the correct Toploader transmission with matching stampings takes time. A full concours restoration of a matching-numbers Boss 302 with all date-coded components can run 4–6 years when engine specialist lead times and parts sourcing delays are included. Budget more time than you think. Boss 302 specialists with the right Cleveland head expertise book 12–18 months out.