I call it a 3.4. There was a 3.5 S38 and M88 earlier. In 1985 I believe it was a M106 and it was considered a 3.4 liter. What is weird is that The m30 was sometimes called a 3.5 but was still 3430cc in 1985. The S38 and M88 3.5 were just over 3450cc so rounded... Login to read more.