[Charles]

John, thanks for the information about the bore size in the CanAm motors! The bore spacing on a standard 427 is 4.84" which would not leave much room for sleeves. Not sure about the use of 'Vega technology' back then. There was a problem with the sleeved aluminum blocks cracking the decks. As a result builders welded in the sleeves at the top and bottom. The coated cylinder walls may have been a later evolution of the motor. The '430' motor would become the '466' motor when the bigger 3.76" crank of the standard '427' was installed. That was the combination Mclaren ran.