Editing Buick V8 engine (section)

===425===
[[File:Super Wildcat 425ci 390hp Engine.jpg|thumb|Super Wildcat {{cvt|425|cid|L|1}} {{cvt|390|hp|0}} engine]]
The {{cvt|425|CID|L|1}} was produced from 1963 to 1966. Its bore and stroke measured {{convert|4.3125|x|3.64|in|mm}}. The largest-displacement version of the Nailhead, it began as an option on the 1963 Riviera, and was later available on the Wildcat and Electra models. The 1964 and 1966 Rivieras used the 425 engine as standard equipment. Mounted on a trolley, Buick 425s were also [[Pratt & Whitney J58#Starting|used as starter motors for the SR-71 Blackbird]] supersonic jet.<ref>{{Cite web|url=https://commons.wikimedia.org/wiki/File:AG330_start_cart.JPG|title=English: SR-71 Blackbird AG330 start cart, Hill Aerospace Museum, Utah|date=8 March 2010|access-date=7 June 2023|via=Wikimedia Commons}}</ref><!--Use of [[Buick V8 engine]] family is also supported by Graham 1996.-->

Four-barrel carburetion was standard on the basic 425, called the Wildcat 465 for the torque (as measured in lb-ft) it developed. The Super Wildcat ([[Regular Production Option]] {RPO}-coded Y48) was available on the 1964 Riviera as a factory option (2,122 produced), 1964 Electras (any model, production numbers unknown), 1965 Riviera Gran Sport and 1966 Wildcat GS, which included two four-barrel carburetors and matching [[intake manifold]]. Coded "MW", these parts were delivered in the car's trunk for dealer installation. Toward the end of the 1966 model year, around May 1966, Buick offered the Super Wildcat 465 with factory-installed 
dual four-barrel [[Carter Carburetor|Carter AFB]] [[carburetor]]s as an "MZ" option. Only 179 of the 1966 Riviera GS cars were built with the MZ package.
[[File:Buick400.jpg|alt=1969 Buick Grand Sport 400 Cubic Inch Engine|thumb|1969 Buick Grand Sport 400 Engine]]