http://www.v8buick.com/showthread.php?t=70275&highlight=wildcat+bolt+pattern http://www.v8buick.com/showthread.php?t=93970&highlight=wildcat+bolt+pattern
What bolt pattern for a Wildcat 1963 The bolt pattern is 5x5, and they tighten and loosen in different directions. Look for the "L" and "R" on the studs.