Classic Muscle
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Authenticity reference

Engine path

numbers matching · documented

Reference Details

Common issue
An engine code or replacement FE engine treated as complete GT-E proof. · 1968 Mercury Cougar GT-E
Confidence
documented · 1968 Mercury Cougar GT-E
Correct value
W-code 427 or late R-code 428 Cobra Jet supported by the complete car record and date-compatible components. · 1968 Mercury Cougar GT-E
Where to check
VIN, invoice/build record, block and component identifiers and dates, and service history. · 1968 Mercury Cougar GT-E
Common issue
A replacement 301 or 305, turbo hardware, hood callout, or engine swap represented as the born-with path · 1980 Pontiac Firebird Trans Am
Confidence
documented · 1980 Pontiac Firebird Trans Am
Correct value
VIN W L37 or W72, VIN T LU8 Turbo, or VIN H California LG4, reconciled to block code, induction, emissions equipment, transmission, axle, dates, and records · 1980 Pontiac Firebird Trans Am
Where to check
VIN, engine stamps and castings, carburetion and turbo hardware, emissions labels, transmission, axle, and build records · 1980 Pontiac Firebird Trans Am

Cars With This Authenticity Marker

2 linked car pages.

Sources & Documentation