The priciest Road Runner sold at auction is an even rarer 1971 Hemi version that crossed the block for exactly $500,000. So, what exactly makes this 1969 example worth more than $250,000?

Some high-performance cars with Hemi engines include the Belvedere (1964-1969), the GTX (1967-1971), the Road Runner ... the engine for its racing ambitions in NASCAR and drag racing.

Prices shown are the prices you can expect to pay for a 1969 Plymouth Road Runner 2 Door Hardtop (Hemi 426) across different levels of condition. Edit options.

Prices shown are the prices you can expect to pay for a 1969 Plymouth Road Runner 2 Door Coupe (Hemi 426) across different levels of condition. Edit options.