The "massively prohibitive" cost of recreating the final scene of The Italian Job has forced Top Gear to pull out of the daredevil stunt.
The BBC show had hoped to re-enact the cliffhanging ending from the classic 1969 film which sees robbers stuck at one end of a coach with their gold precariously balanced at the other.
Members of the Royal Society of Chemistry were to take part in the project after it ran a competition to solve the puzzle of saving the gold and the robbers' lives.
A Top Gear spokeswoman said: "We thought it would be brilliant to recreate the Italian Job scene, so we were disappointed when, having spent a lot of time researching all the options thoroughly with the Royal Society of Chemistry, we found that the cost of the stunt was massively prohibitive for one short film in one programme.
"We've got a set budget and we think we can make that money go further elsewhere."
The Society was disappointed with the decision, saying in a statement: "We are shocked that a team of self-proclaimed petrol-heads retreated from a great opportunity to celebrate the most important British car film ever made."
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