I am reluctantly selling my RARE (less than 3823 units produced) 1970 Monte Carlo SS 454; LS5 (469.0 CID after rebuild). Documented numbers matching, VIN and block match build date Sept 1970. Car never smoked in and always garaged. I am the 2nd owner and purchased the car from the original owner who is in his early 80's. I have tons of paperwork to go with the car including the original invoice from 10/2/1969 which I have included in one of the pictures. I have tons of receipts and original dealer documentation that is as equally impressive which speaks to the excellent condition of this rare muscle car. Chrome, glass, trim, seats, carpet, dash, rear speaker panel are all in exceptionally great condition. The interior is 100% original and as you can see, in excellent condition. Being an extreme car enthusiast who appreciates originality, I chose not to modify or add anything to the interior of the car. Keeping this beauty in its original condition has been my goal since ownership. This rare muscle car looks like it's been sitting in a time capsule, the pictures do not do it justice at all. Engine was professionally rebuilt in early 2026 by Lewis Racing Engines in Laytonville, Ca. and has less than 1000 miles. The car has 53000 ORIGINAL miles which I can substantiate as being true through stacks of receipts and registration documents. I'm posting this at a price that should interest those who can appreciate and understand the value of a numbers matching 70's Big-block Super Sport. That said, I will entertain any reasonable offers. I am motivated to sale and hopeful this will go to a home that can appreciate the condition and rarity of this stunning Big-block super sport. I will NOT respond to tire kickers or those who feel the need to low ball me or insult me by offering me way less than what they know the car is worth. This car is ABSOSULETY AMAZING! (Your neighbors will hear you coming and going) Don't forget to check out the video. Additional videos and pictures available upon request and I'm happy to answer any questions. BTW, I didn't add A/C to the car because again, I wanted to keep the car in its original condition and didn't want to add anything that wasn't factory. Thanks for looking!
Engine Specs;
SRP pistons 139479
Pro Seal Moly Piston Rings
SCAT 9-10454 Crank
Scat 2-ICR6135 Connecting Rods
Engine Balanced / (see data sheet)
Engine Dyno'd / (see data sheet)
Summit 1253 Cam, Billet 4-7 Swap- Roller
PRW 0245403 Roller Rockers
TrickFlow Pushrods
Morel 5374-16 HYD Roller Lifters
New Harmonic Balancer
ARP bolts used throughout engine rebuild
What I've done;
Brakes checked 2026
New tires (2024) on 15x8 Rally wheels
New battery (2024)
Radiator serviced with new radiator cap
New belts, hoses, and clamps
New hood hinges, bolts, and springs
New Aluminum high flow Edelbrock water pump with performance thermostat
New power steering hose
New performance fuel line (Carb to fuel pump)
New Power Master 100amp alternator
$600.00 window tint - 2/2026
New fuel Filter
New Edelbrock Carburetor w / electric choke
New headlights
Custom exhaust w flow master mufflers, gaskets, hangers, exhaust part turn downs. $2500
New battery cables (Neg and Pos)
New flamethrower coil, HEI distributor, spark plugs, and wires.
Have additional parts that you will receive with car including original Rochester carburetor, etc...
Fuel gauge doesn't appear to be accurate
Paint chips (see pics) I've done my best to provide close-ups of any paint chips.
Radio works but speaker may be blown.
Clock doesn't appear to work; it's running but I didn't see the need to start ripping apart the dash.
Spare tire and Jack missing
Stock Engine configuration / additional stock specs
90° OHV V8 (Chevrolet Mark IV big-block, LS5)
Displacement
454 cu in (7,439 cc)
Horsepower (SAE gross)
1970: 360 hp @ 4,800 rpm
Torque (SAE gross)
1970: 500 lb-ft @ 3,200 rpm
Induction type
Naturally aspirated, Rochester Quadrajet 4-bbl carburetor
Redline
~5,500 rpm
Fuel system
Carbureted (mechanical fuel pump)
Compression ratio
1970: ~10.25:1
Bore x Stroke
4.251 in x 4.00 in
Full Performance Specifications
0–60 mph
~6.8–7.5 seconds
Quarter-mile
~15.0–15.5 sec @ ~92–95 mph
Top speed
~125–130 mph (axle-ratio dependent)
Curb weight
~3,900–4,050 lb (typical equipment)
Layout
Front-engine, rear-wheel drive (FR)
Brakes
Power front discs, rear drums
Suspension
Front: unequal-length control arms, coils; Rear: 4-link live axle, coils; heavy-duty tuning; rear level control on SS
Gearbox
Turbo Hydra-Matic 400, 3-speed automat
60–0 mph braking
~150–160 ft (period bias-ply tires)
Variant Breakdown (RPO Z20 SS 454)
While the Monte Carlo line offered various small- and big-block options, the SS 454 was a distinct package with specific content and emblems. It was produced for only two model years:
Production
1970 SS 454 (RPO Z20)
~3,823 units
LS5 454, 360 hp (SAE gross), 500 lb-ft;
SS 454 badging; heavy-duty suspension; front discs; rear automatic level control; Monte-specific grille; bright moldings typical of Monte Carlo; Rally-type wheels and raised-white-letter tires common
Collector interest reflects its brief run and specification. Documented, numbers-matching SS 454s trade at a premium over small-block Montes, with highly original or expertly restored cars commanding strong prices. Historically, well-kept examples have sold in a broad range depending on provenance, options, and correctness, with exceptional cars capable of reaching notably higher results than driver-grade examples.
How many were built?
Approximately 3,823 SS 454s in 1970
Output (SAE gross)
360 hp / 500 lb-ft
Transmission
TH400 automatic (3-speed)
Front/Rear Suspension
Coils, unequal A-arms / 4-link live axle, coils; heavy-duty tuning; level control
Brakes
Power front discs, rear drums
Approx. curb weight
~3,900–4,050 lb
