answersLogoWhite

0

Zero. Pontiac never installed the 428 in the GTO. GM had a corporate ban on engines larger than 400 CID until 1970. In 1970, the 455 replaced the 428. ALL GTO's built from 1964-1966 came with 389's. ALL GTO's built from 1967-1969 came with 400's.

User Avatar

Wiki User

12y ago

What else can I help you with?