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Authenticity reference

Factory engine and transmission identifiers

numbers matching · documented

1974 Plymouth Duster photographed as a 5.9-liter V8 car; VS29L4 records, not the visible badge or plate, establish factory Duster 360 identity 1974 Plymouth Duster 360

Reference Details

Common issue
A correct-family replacement engine or transmission represented as original without identifier-format, VIN-derivative, assembly-date, and application agreement.
Confidence
documented
Correct value
The 1974 Chrysler parts catalog places the 318/360 serial pad at the left front of the block below the cylinder head, the manual-transmission identifier below centerline on the front right side, and the automatic identifier on the left oil-pan rail; production-installed engines and transmissions also carry a VIN derivative.
Where to check
Engine serial pad, manual-transmission front right case, automatic-transmission left oil-pan rail, and the individual car's VIN, fender tag, broadcast sheet, and scheduled-build evidence

Cars With This Authenticity Marker

1 linked car page.

Sources & Documentation