Authenticity reference

Engine production code stamp location and GS 455 code family

trim correctness · documented

VIN series, body, year, and Stage 1 evidence checks 1970 Buick GS 455

Reference Details

Common issue: A GS 455 claim supported only by exterior identification lacks engine-code support for the installed engine.
Confidence: documented
Correct value: The 455 CID V8 production code is stamped between the two rear spark plugs and the left exhaust manifold; the 1970 GS 455 listing shows SR and SS 455 engine codes.
Where to check: Engine block area between the two rear spark plugs and the left exhaust manifold on the 455 CID V8

1 linked car page.

1970 Buick

Factory Buick GS 455 series