Right. But the article was about the same displacement engine built by different manufacturers. Lincoln and Mercury had a 383 from 58-60. ... View more

And optional in Wildcats and Electras when introduced in 1962. 425 was standard in the 66 Riviera only. 66 was the first and only year the "new" Rochester Quadrajet carb was used on the nailhead. Same carb was used on the 65 Chevy 325hp engine. ... View more

No other manufacturer that I know of shared that displacement. That's what this article was basically about. ... View more

The other 389 was a Ford medium duty truck engine.   ... View more

Didn't see  the 425. Article says the 401 was the biggest Buick "nailhead". The 425 was. Produced from 1962 -66.Also, the 425 Olds from 65-67(?) and the 425 Caddy from 77-80(?). ... View more