As automobiles offered by the major automakers began increasing performance, the lure of hot rods began to wane. It was no longer necessary to put a Cadillac engine in a Ford roadster to be fast. It was now possible to buy a muscle car that outperformed nearly any hot rod, with more passenger room, and without having to expend the effort of building and tuning the car oneself. After the 1973 Oil Crisis, the public called on automakers to offer safety and fuel efficiency over performance. The resulting decrease in an average car's performance led to a resurgence of hot rodding, although the focus was on driving hot rods over racing so the term 'street rod' was coined to denote a vehicle manufactured prior to 1949, often with a more reliable late model drive train. Street rodding as it was now known was a different phenomenon than hot rodding, as street rodding was mainly family-oriented. National events were hosted by the National Street Rod Association (NSRA), which also stressed safety as the NHRA did 20 years before. Each NSRA event has a 'Safety Inspection Team' that performs a 23-point inspection process beyond normal State Safety Inspections. In the mid-1980s, as stock engine sizes diminished, rodders discovered the all-aluminum 215 (Buick or Olds) could be stretched to as much as 305 cu in (5 l), using: the Buick 300 crank, new cylinder sleeves, and an assortment of non-GM parts, including VW & Mopar lifters and Carter carb. It could also be fitted with high-compression cylinder heads from the Morgan +8. Using the 5 liter Rover block and crank, a maximum displacement of 317.8 cu in (5,208 cc) is theoretically possible.