the difference for lifters was manual or automatic, and the Z means standard [manual] transmission, not 'standard engine'
Bill
T55Z means 1955 car engine from the Tonawana plant -
Regular engine. The Regular engine would have had solid lifters and would have been delivered with the
Regular transmission, a 3-speed.
It is either interesting or odd that GM seemed to use the term "Regular" equipment with cars and "Standard" equipment with trucks?
