This format remained unchanged through the first three years, although four straight rainouts in 1977 shortened the series to only 4 races. The series' final season in 1978 saw major changes to the format as four more tracks joined the circuit - Stafford Motor Speedway, Westboro Speedway, Seekonk Speedway and Monadnock Speedway. Although the series expanded to 7 races total and the race distances doubled to 100 laps, each track would now host only 1 event.

Yankee All-Star League events are also notable as some of only a handful of events in Speedbowl history in which 9-time NASCAR Modified Champion Richie Evans competed. His runner-up finish to Ken Bouchard during the inaugural Yankee All-Star event at Waterford in July of 1975 was the Rapid Roman's best career finish at the shoreline oval - making the Waterford Speedbowl one of very few tracks in the country that the Modified Legend competed on without ever winning a feature event - a truly rare distinction for the shoreline oval.