1972 Dodge Demon 340

Compact performance powered by Chrysler 340 four-barrel LA V8.

1972 Dodge Demon front three-quarter view showing the full-width grille, coupe profile, and body-side stripe

Engine H-code 340 four-barrel LA V8

Factory rating 240 net hp

Transmissions Three-speed, A833 four-speed, or 727 TorqueFlite

Reported production 8,700 Demon 340s

Story

1972 Dodge Demon 340

The Demon 340 returned for 1972 as Dodge's compact A-body performance coupe. Its H-code 340 four-barrel LA V8 was rated at 240 net horsepower, backed by a floor-shifted three-speed manual, optional A833 four-speed, or optional 727 TorqueFlite automatic.

The 1972 model is easy to distinguish from the first-year Demon by its full-width grille, revised lamps and side markers, metal Demon and 340 identification, and available single twin-intake hood scoop. Rallye suspension and 10-inch drum brakes were standard performance equipment, while power front discs, Sure-Grip, bucket seats, a console, and appearance treatments were available.

The cited model reference reports 8,700 Demon 340s for 1972. That figure is retained as a reported count rather than presented as a reconciled factory-ledger total. The same boundary applies to the model-year paint palette: it is useful restoration context, but each car's original finish and stripe combination should come from its fender tag, broadcast sheet, or surviving paperwork.

Authentication begins with an LM29H2 VIN pattern and agreement among the fender tag, broadcast sheet, engine and transmission stampings, axle evidence, paint, trim, and options. Demon graphics, hood scoops, or an installed 340 cannot establish an original Demon 340 by themselves.

**1972 Dodge Demon front three-quarter and engine-bay context; the image establishes model-year body details, not 340 identity**Captainpisslord via Wikimedia Commons · CC0

Price history

Values

Nominal dollars from original price sheets, auction archives, and approved value references.

Original Price

A verified original price is not yet available for this car.

Market Observations

Auction sale $88,500

Mar 8, 2026 · Bring a Trailer
Factory-sunroof H-code automatic Demon 340 LM29H2B464629 after a rotisserie refurbishment with a replacement date-correct 340. · restored · excellent Bring a Trailer records an $88,500 sale for VIN LM29H2B464629. The archive documents the H-code and sunroof fender-tag configuration, registry context, a 2009-2013 rotisserie refurbishment, replacement date-correct 340, rebuilt automatic, repaint, retrim, records, literature, and disclosed imperfections. The rare sunroof equipment limits comparison with ordinary Demon 340 cars.
1972 Dodge Demon 340 sunroof LM29H2B464629
Auction sale $35,043

Jul 24, 2025 · Hagerty Marketplace
Matching-number H-code automatic Demon 340 LM29H2B250757 with a color change and multiple induction, exhaust, air-conditioning, axle, and interior updates. · modified · good Hagerty Marketplace reports a $35,043 sold total for VIN LM29H2B250757; the bid history identifies a $32,750 winning bid before the marketplace total. The archive documents the matching-number 340 plus carburetor, headers, exhaust, air-conditioning, differential, radio, gauges, steering-wheel, carpet, and paint changes, along with disclosed chips, a paint bubble, and imperfect chrome. Its 2022 sale is excluded as an earlier repeat-chassis result.
1972 Dodge Demon 340 LM29H2B250757
Auction sale $126,500

Jan 22, 2025 · Barrett-Jackson Scottsdale 2025
Four-speed H-code Demon 340 LM29H2B164513 after extensive refurbishment with replacement 340, Six Pack induction, body repair, repaint, and QA1 suspension. · modified · excellent Hagerty records a $126,500 sale and #2 Excellent condition for VIN LM29H2B164513. Classic.com classifies the car as modified, while its prior BaT archive documents a replacement 340, three two-barrel carburetors, aftermarket heads, QA1 suspension, body repairs, repaint, retrim, and extensive refurbishment. The earlier 2024 no-sale is excluded as a repeat-chassis result.
1972 Dodge Dart Demon 340 LM29H2B164513 past sale 1972 Dodge Demon 340 LM29H2B164513 1972 Dodge Demon 340 Six Pack four-speed LM29H2B164513
Auction sale $40,700

Jul 27, 2024 · Mecum Harrisburg 2024
Automatic H-code Demon 340 LM29H2B270591 with Wilwood front discs, Billet Specialties wheels, hood pins, and a front spoiler. · modified · good Mecum records a $40,700 sale for VIN LM29H2B270591. The archive identifies the 340 automatic configuration and visible modifications including Wilwood front discs, Billet Specialties wheels, hood pins, and a front spoiler. Modified/good is a conservative classification based on the disclosed equipment and presentation.
1972 Dodge Demon 340 LM29H2B270591
Auction sale $38,000

Sep 12, 2023 · Bring a Trailer
Original-owner H-code Demon 340 LM29H2B229416 with a replacement 404-cid engine, prior bracket-racing use, and substantial chassis modifications. · modified · good Bring a Trailer records a $38,000 sale for VIN LM29H2B229416. The archive documents the factory H-code identity and original purchase records alongside a replacement 404-cid engine, prior bracket-racing history, altered front suspension and steering, Wilwood four-wheel discs, drivetrain changes, repaint, and digital gauges. Modified/good prevents comparison as a stock 340 survivor.
404-powered original-owner 1972 Dodge Demon LM29H2B229416
Auction sale $60,500

May 20, 2021 · Mecum Indy 2021
Automatic H-code Demon 340 LM29H2B486898 sold new through Grand Spaulding Dodge with extensive original dealer paperwork. · modified · unknown Mecum records a $60,500 sale for VIN LM29H2B486898. The archive documents the H-code 340, automatic transmission, window sticker, MSO, dealer order and shipping records, receipts, and broadcast sheet, plus GSS stickers, an aftermarket Sun tachometer, and show-quality paint. Modified classification records those deviations without representing the car as a GSS conversion; condition remains unknown.
1972 Dodge Demon 340 LM29H2B486898 1972 Dodge Dart Demon 340 LM29H2B486898 past sale
Auction sale $33,550

Jan 5, 2020 · Mecum Kissimmee 2020
Automatic H-code Demon 340 LM29H2B356610 classified #3 Good by Hagerty. · unknown · good Hagerty records a $33,550 Mecum sale for VIN LM29H2B356610 and classifies the car #3 Good. Build state remains unknown because the reviewed archive does not establish original, survivor, restored, or modified status. Earlier 2018 and 2019 results for the same chassis are excluded.
1972 Dodge Dart Demon 340 LM29H2B356610 past sale
High bid $12,600

Oct 17, 2004 · Collector Cars International
Factory H-code 1972 Demon 340 coupe LM29H2B302758 offered at Branson in 2004. · unknown · unknown Hagerty records a $12,600 no-sale high bid for exact H-code VIN LM29H2B302758. The archive does not support a conservative build-state or condition classification, so both remain unknown. A no-sale high bid is not a completed transaction.
1972 Dodge Dart Demon 340 LM29H2B302758 past sale

Values move with paperwork, originality, options, condition, venue, and body style. High bids and guide values are labeled separately from completed sales.

Reference records

Options, Colors & Components

Source-backed details for trim, chassis, production, and authenticity.

Engine Details

340 block casting number 2780930 followed by 340 · 1971-1972 Dodge Dart Demon 340 / 340 LA small-block reference · block / casting number · Driver side of block, just below the deck
Bore and stroke 4.04 x 3.31 inches · 1972 Demon 340 LA-series small-block V8 · engine assembly / specification
Compression ratio 8.5:1 · 1972 340 four-barrel · engine assembly / specification
Advertised net horsepower 240 hp · 1972 340 four-barrel · engine assembly / specification
Cast-crankshaft changeover engine serial number HM340R-3911-8000 · 340 engines built from April 11, 1972 changeover cited from Chrysler TSB by Hemmings · crankshaft / stamp
Connecting rods Forged-steel connecting rods · 1972 Demon 340 LA-series small-block V8 · connecting rod / specification
Pistons Cast-aluminum pistons · 1972 Demon 340 LA-series small-block V8 · piston / specification
Valve sizes 1.88-inch intake valves and 1.60-inch exhaust valves · 1972 340 four-barrel · cylinder head / specification
Rocker-arm ratio 1.50:1 shaft-mounted rocker arms · 340 four-barrel engine family as described for 1971-1972 Demon 340 buyer guidance · valve train / specification
Camshaft type Hydraulic camshaft · 340 four-barrel engine family as described for 1971-1972 Demon 340 buyer guidance · camshaft / specification
Intake manifold Cast-iron intake manifold · 1972 Demon 340 four-barrel fuel system · intake manifold / specification
Carburetor type Carter Thermo-Quad four-barrel carburetor · 1972 Demon 340 four-barrel fuel system · carburetor / specification

Transmission

Factory transmission A-230 floor-shift three-speed manual
Factory transmission A833 four-speed manual
Factory transmission A727 TorqueFlite automatic

Options

340 Four-Barrel reference for the 1972 Dodge Demon 340Classic Muscle · Reference illustration

E55 340 four-barrel engine standard · performance · Demon 340 engine identity code cited in buyer-guide and auction decode examples.
D13 Three-speed floor-shift manual transmission standard · performance
D21 Four-speed floor-shift manual transmission optional · performance
D34 TorqueFlite automatic transmission optional · performance
V21 Performance hood treatment optional · appearance
A88 Interior Decor Group optional · interior

Production

Transmission and Axle reference for the 1972 Dodge Demon 340Classic Muscle · Reference illustration

1972 Dodge Demon 340 by engine · 8,700 · reported

Authenticity

Brake Choices reference for the 1972 Dodge Demon 340Classic Muscle · Reference illustration

VIN engine digit H in LM29H2 identifies the 340 engine in 1972 examples · VIN plate on driver-side dashboard at base of windshield · fraud detection
Fender tag location and content Driver-side inner fender tag may show VIN, scheduled production date, sales codes, paint and trim · Driver-side inner fender · trim correctness
Engine/transmission sales codes E55 340; D13 three-speed; D21 four-speed; D34 TorqueFlite · Fender tag/build documentation where present · fraud detection
Transmission partial VIN stamping A piece of the VIN sequence may be stamped on passenger side of transmission casing · Passenger side of transmission case · numbers matching
Body partial VIN stamping 1972-1975 A-bodies have eight characters from the VIN stamped on the left-hand side of the deck-lid seal lip · Left-hand side of the deck-lid seal lip · fraud detection

Still Researching

engine The H-code 340 identity, block casting number, bore/stroke, compression, net horsepower, major rotating assembly and valvetrain specifications, Carter Thermo-Quad/cast-iron intake description, and the reported April 11, 1972 cast-crankshaft changeover serial are recorded, but complete carburetor list numbers, engine assembly/date-code tables, full casting tables, and car-specific stamping validation are not.
transmission All three transmission paths are recorded, but complete application numbers and date windows are not.
rear axle The standard 3.23 open path, optional 3.23 Sure Grip path, and optional/required 3.55 Sure Grip path are recorded, but the complete ratio and sales-code matrix is not reconciled.
brakes Standard drums and optional power front discs are recorded, but every package dependency and component number is not.
suspension Rallye suspension specifications are recorded, but complete torsion-bar, spring, shock, and anti-roll-bar part applications are not.
option packages Major drivetrain, hood, and interior options are recorded, but the complete ordering and incompatibility matrix is not.
production The reported 8,700-car count is recorded, but a factory ledger or authoritative registry reconciliation is still needed.
paint colors The 1972 Dodge model-year palette is recorded, but Demon 340 restrictions and stripe pairings require factory documentation.
trim and appearance The 1972 grille, lamps, markers, badges, stripes, hood scoop, and wheel context are recorded, but the complete sales-code matrix is not.
interior Seat, gauge, console, steering-wheel, and shifter choices are recorded, but the complete trim-code and upholstery matrix is not.
authenticity markers VIN, fender-tag, transmission-stamp, and 1972 A-body deck-lid-seal body-stamp checks are recorded, but exact engine and date-window guidance is not complete.