Pontiac Engines are Chevrolet in Canada
See attached files, one is from Trans Am historical records verifying existence of Chevy small block Firebirds and the other a GM Canada ad with 68 Firebird and 327 Astro-Flash in copy.
You are right in that in 1971 GM Canada began using Pontiac Blue Blocks in place of big block Chevrolets in the big cars but oranage small blocks continued until the switch to the corporate blue in 1977.
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