Authenticity reference

Engine identity

numbers matching · documented

1965 Chevrolet Malibu SS396 factory brochure image; exact-year SS396 context, not standalone individual-car proof. 1965 Chevrolet Chevelle Malibu SS 396 Z16

Reference Details

Common issue: A correct-type replacement engine or missing supercharger is represented as original. · 1957 Studebaker Golden Hawk
Confidence: documented · 1957 Studebaker Golden Hawk
Correct value: PS-series supercharged 289 number within the 1957 sequence beginning PS-1001 · 1957 Studebaker Golden Hawk
Where to check: Stamped number at the front upper block and production order · 1957 Studebaker Golden Hawk
Common issue: A later W-engine, restamped pad, or correct-looking induction does not establish factory installation. · 1961 Chevrolet Impala Super Sport
Confidence: documented · 1961 Chevrolet Impala Super Sport
Correct value: Date-compatible 348 or 409 assembly, suffix, castings, induction, and paperwork consistent with the claimed configuration · 1961 Chevrolet Impala Super Sport
Where to check: Engine pad, block and head castings, intake and carburetors, and original records · 1961 Chevrolet Impala Super Sport
Common issue: The Z16 engine described as the later solid-lifter L78 396/375 hp engine. · 1965 Chevrolet Chevelle Malibu SS 396 Z16
Confidence: documented · 1965 Chevrolet Chevelle Malibu SS 396 Z16
Correct value: L37 396/375 hp hydraulic-lifter Z16 engine evidence, not a later L78 assumption · 1965 Chevrolet Chevelle Malibu SS 396 Z16
Where to check: Engine documentation, engine pad/code evidence, and supporting car paperwork · 1965 Chevrolet Chevelle Malibu SS 396 Z16
Common issue: A later Oldsmobile 400 or 455 can be installed and dressed to resemble the original engine. · 1965 Oldsmobile Cutlass 442 400
Confidence: documented · 1965 Oldsmobile Cutlass 442 400
Correct value: 400-cubic-inch Oldsmobile V8, 4.000 x 3.975-inch bore and stroke, 10.25:1 compression, and 345-hp specification · 1965 Oldsmobile Cutlass 442 400
Where to check: Engine casting, date codes, assembly stamp, cylinder heads, and car-specific records · 1965 Oldsmobile Cutlass 442 400
Common issue: Iron-block L72, service replacement, or modern crate 427 substituted for the original ZL1 assembly. · 1969 Chevrolet Camaro COPO 9560 ZL1
Confidence: documented · 1969 Chevrolet Camaro COPO 9560 ZL1
Correct value: ZL1 427 ci Mark IV V8 with aluminum block and heads · 1969 Chevrolet Camaro COPO 9560 ZL1
Where to check: Engine casting, assembly stamp, dates, and paperwork matched to the vehicle chronology · 1969 Chevrolet Camaro COPO 9560 ZL1
Common issue: Generic 427 or service-replacement engines represented as original COPO L72 engines. · 1969 Chevrolet Camaro COPO 9561 L72
Confidence: reported · 1969 Chevrolet Camaro COPO 9561 L72
Correct value: L72 427 cu in iron-block Mark IV V8, 425 hp reported · 1969 Chevrolet Camaro COPO 9561 L72
Where to check: Engine pad stamp, casting numbers, dates, and vehicle paperwork; do not rely on badges or captions · 1969 Chevrolet Camaro COPO 9561 L72
Common issue: Replacement 427 or later big-block installed in a non-Yenko Camaro. · 1969 Chevrolet Camaro Yenko SC 427
Confidence: reported · 1969 Chevrolet Camaro Yenko SC 427
Correct value: Chevrolet L72 427 big-block V8 consistent with the Yenko/COPO 9561 pathway · 1969 Chevrolet Camaro Yenko SC 427
Where to check: Engine pad stamp, casting numbers, dates, and vehicle paperwork · 1969 Chevrolet Camaro Yenko SC 427
Common issue: Replacement small-block, incorrect displacement, or restamped engine represented as original DZ 302 equipment. · 1969 Chevrolet Camaro Z/28
Confidence: reported · 1969 Chevrolet Camaro Z/28
Correct value: 302 cu in Chevrolet small-block with Z/28-correct specification and date alignment · 1969 Chevrolet Camaro Z/28
Where to check: Engine pad stamp, casting numbers, date codes, carburetor, and paperwork · 1969 Chevrolet Camaro Z/28
Common issue: Replacement small-block, Six Barrel Trans-Am engine, or later 360 represented as original 1970 Duster 340 equipment · 1970 Plymouth Duster 340
Confidence: reported · 1970 Plymouth Duster 340
Correct value: H-code / E55-style 340 four-barrel evidence should agree with the car's documentation · 1970 Plymouth Duster 340
Where to check: VIN, fender tag, broadcast sheet, engine pad/casting evidence, and restoration records · 1970 Plymouth Duster 340
Common issue: Later 455 HO/SD language or swapped 455 engines can be incorrectly applied to 1970 GTOs. · 1970 Pontiac GTO 455 HO
Confidence: reported · 1970 Pontiac GTO 455 HO
Correct value: 1970 455 HO is a D-port Pontiac 455 HO/L75 context, not the 1971-1972 round-port 455 HO or the later SD-455. · 1970 Pontiac GTO 455 HO
Where to check: Engine block code, casting number, date code, cylinder-head casting, and PHS paperwork. · 1970 Pontiac GTO 455 HO
Common issue: Replacement small-block, later 360, or visual-only 340 presentation treated as born-with 1971 Demon 340 equipment · 1971 Dodge Demon 340
Confidence: documented · 1971 Dodge Demon 340
Correct value: E55 340 four-barrel evidence should agree with the car documentation; 1971 Demon 340 used the 340 four-barrel as standard equipment · 1971 Dodge Demon 340
Where to check: VIN, fender tag, broadcast sheet, engine pad/casting evidence, and restoration records · 1971 Dodge Demon 340
Common issue: Replacement small-block, later 360, or visual-only 340 presentation treated as born-with 1971 Duster 340 equipment · 1971 Plymouth Duster 340
Confidence: reported · 1971 Plymouth Duster 340
Correct value: E55 340 four-barrel evidence should agree with the car documentation; 1971 Duster 340 used the 340 four-barrel as standard equipment · 1971 Plymouth Duster 340
Where to check: VIN, fender tag, broadcast sheet, engine pad/casting evidence, and restoration records · 1971 Plymouth Duster 340
Common issue: A replacement 350 can reproduce visible L82 equipment. · 1973 Chevrolet Camaro Z28
Confidence: reported · 1973 Chevrolet Camaro Z28
Correct value: Correct suffix, partial VIN, castings, dates, Quadrajet application, and L82 hardware agree · 1973 Chevrolet Camaro Z28
Where to check: Engine pad, block, heads, carburetor, intake, valve covers, air cleaner, and paperwork · 1973 Chevrolet Camaro Z28
Common issue: A replacement 340 or current engine-bay appearance represented as proof of an original 340 car · 1973 Plymouth Cuda
Confidence: documented · 1973 Plymouth Cuda
Correct value: G in the fifth VIN position supports the 318 path; H supports the 340 path · 1973 Plymouth Cuda
Where to check: VIN, fender tag, broadcast sheet, window sticker, engine pad and castings, and dated records · 1973 Plymouth Cuda
Common issue: A replacement 350 can reproduce visible L82 equipment. · 1974 Chevrolet Camaro Z28
Confidence: reported · 1974 Chevrolet Camaro Z28
Correct value: Correct Z28 suffix, partial VIN, castings, dates, Quadrajet, dual-snorkel air cleaner, and package hardware agree · 1974 Chevrolet Camaro Z28
Where to check: Engine pad, block, heads, carburetor, intake, air cleaner, valve covers, and records · 1974 Chevrolet Camaro Z28
Common issue: Replacement 455s, later induction, and reproduction decals can resemble the W-30 presentation. · 1974 Oldsmobile Hurst/Olds W-30 455
Confidence: documented · 1974 Oldsmobile Hurst/Olds W-30 455
Correct value: VIN-matched 396021F/FA 455 block, KA heads, 412753 intake, 7044559 Quadrajet, and date-compatible components · 1974 Oldsmobile Hurst/Olds W-30 455
Where to check: Driver-side block VIN pad, castings, carburetor stamp, distributor, manifolds, and paperwork · 1974 Oldsmobile Hurst/Olds W-30 455
Common issue: A replacement 360 or current engine-bay appearance represented as proof of an original 360 car · 1974 Plymouth Cuda
Confidence: documented · 1974 Plymouth Cuda
Correct value: G in the fifth VIN position supports the 318 path; L supports the 360 path · 1974 Plymouth Cuda
Where to check: VIN, fender tag, broadcast sheet, window sticker, engine pad and castings, and dated records · 1974 Plymouth Cuda
Common issue: Carburetor conversions, replacement blocks, missing EFI, and ordinary Vega engines are common. · 1975 Chevrolet Cosworth Vega
Confidence: reported · 1975 Chevrolet Cosworth Vega
Correct value: VIN-code E engine, component numbers, production/date code, vehicle VIN stamp, EFI, twin-cam head, and header agree · 1975 Chevrolet Cosworth Vega
Where to check: VIN, block, bellhousing flange, head, cam carrier, EFI hardware, exhaust, and records · 1975 Chevrolet Cosworth Vega
Common issue: Small-block swaps are common; displacement and badges do not establish the original engine. · 1975 Chevrolet Monza 2+2
Confidence: documented · 1975 Chevrolet Monza 2+2
Correct value: VIN code A for 140 or B for 262, plus matching engine suffix, dates, emissions equipment, and paperwork · 1975 Chevrolet Monza 2+2
Where to check: VIN, front-right V8 pad or right side of four-cylinder block, emissions label, invoice, and build sheet · 1975 Chevrolet Monza 2+2
Common issue: Replacement 455s and reproduction paint or decals can resemble the original installation. · 1975 Oldsmobile Hurst/Olds W-30 455
Confidence: documented · 1975 Oldsmobile Hurst/Olds W-30 455
Correct value: VIN-matched 396021FA 455 block, KA heads, 412753 intake, 7045184 Quadrajet, 1112937 HEI distributor, and date-compatible components · 1975 Oldsmobile Hurst/Olds W-30 455
Where to check: Driver-side block VIN pad, castings, carburetor stamp, distributor, manifolds, and paperwork · 1975 Oldsmobile Hurst/Olds W-30 455
Common issue: Carburetor conversions, replacement blocks, missing EFI, and ordinary Vega engines are common. · 1976 Chevrolet Cosworth Vega
Confidence: reported · 1976 Chevrolet Cosworth Vega
Correct value: VIN-code O engine, component numbers, production/date code, vehicle VIN stamp, EFI, twin-cam head, and header agree · 1976 Chevrolet Cosworth Vega
Where to check: VIN, block, bellhousing flange, head, cam carrier, EFI hardware, exhaust, and records · 1976 Chevrolet Cosworth Vega
Common issue: An ordinary or replacement 350 can carry visible Z28 equipment. · 1977 Chevrolet Camaro Z28
Confidence: reported · 1977 Chevrolet Camaro Z28
Correct value: Z28-specific LM1 configuration, dates, stamp, partial VIN, Quadrajet, cam, air cleaner, and exhaust agree · 1977 Chevrolet Camaro Z28
Where to check: Engine pad, block, heads, carburetor, intake, air cleaner, exhaust, and records · 1977 Chevrolet Camaro Z28