69 bonneville
One more note. In '69 the YH code 428 became the standard engine in the Bonneville replacing the 400 which was the base motor in '67 and '68. The YK code 428 was optional.
Other 400 cid were also optional but it is fairly uncommon although I have seen 1 or 2 400 cid 2bbl cars. These were special ordered most likely because the owner wanted to save some money on fuel since they used regular v. premium gas.
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