Here are two direct quotes from Musclecarclub.com-Chevrolet Chevelle-History
1969 - "Late in the 1969 model year, the 396 was bored out to 402 cubic engines, reportedly to meet new emission standards."
1970"Responding to the lifting of GM's ban on engines larger than 400 cid in midsize cars, Chevrolet responded by dropping in a new 454 cubic engine into its Chevelle SS."                                                            
                                                        Larry (Z)

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