-I have M/T valvecovers for a SBC-BBC-And a Pontiac V8-The SBC covers are #103R-50B they say "JAPAN"
The BBC covers are #103R-48B they say "MADE IN JAPAN"
The Pontiac are #140R-58B they say "HOLLEY-MICKEY THOMPSON" they are the only set I have that DONT SAY JAPAN OR MADE IN JAPAN ANYWHERE....I have a few more set's i will check ,but I figure these part#'s should help anyone looking for a set on ebay...I think these are "DAY2" and the Most Popular valve covers made,but there are others that are Period correct-I went with a EARLY set of "CORVETTE" aluminum valvecovers with the line that goes thru the "O"-I use em because they are RARE &have no holes in them at all..Also I made my SBC look like a EARLY 'Vette Engine..