From what I recall reading, prior to the end of the 1970 model year, the casting number was either partially, or fully removed for the ‘915, or SR for earlier castings.
It seems as though after the end of the 19670 model year, the block casting number was left as-is, and the block was just finished as required.
__________________
1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
|