Stage 2 motors were used in the Bush "Grand National" series, hence the name Buick Grand National. The buick grand national was named that to celebrate its success in that series. The stage 2 motor was also used in the Indy 500 cars. The buick stage 2 motor held the record for 10-15 years at the brickyard at around 236mph. They were race blocks made by buick for racing.