The Shocking Truth Behind Bill Jenkins Deadly Grumpys Toy

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This is a tale of engineering brilliance, technical defiance, and a small-block so powerful and precise that NHRA officials tried to stop it before it even ran.

history
The 1972 Chevrolet Vega built by Bill “Grumpy” Jenkins is one of the most revolutionary and controversial cars in NHRA Pro Stock history. Conceived in secrecy inside a Pennsylvania garage, it was a 331 cubic inch small-block monster wrapped in a cheap economy car body — a combination that humiliated big-block HEMIs and forced NHRA to rewrite the rulebook.

While rivals fought with raw displacement, Jenkins engineered perfection: a lightweight tube-frame chassis hidden beneath Vega bodywork, a high-revving small-block screaming past 9,000 RPM, and design tricks that blurred the line between “stock” and prototype. His Vega wasn’t built to be legal — it was built to win.

Key Specifications
Displacement: 331 cubic inches (bored 327)
Configuration: Small-block V8
Compression Ratio: 13.0:1
Horsepower: 580–680 hp at 9,300 RPM
Chassis: Full tube-frame (Funny Car–style)
Rear End: Dana 60 (rifle-drilled, lightweight)
Induction: Custom Holley setup, fender-exit headers
Suspension: MacPherson strut front, 3-link rear

The Origins of the Pro Stock Revolution
What began as a rule-bending experiment became the foundation of modern Pro Stock. Jenkins’ Vega proved that brains could beat brawn — and that an economy car could dethrone the most powerful muscle machines in America. It was fast, fearless, and so far ahead of its time that NHRA tried to erase it from history.

Most Hated Champion: This Car PISSED OFF The Whole NHRA - John Force
https://www.youtube.com/watch?v=11Z3m5WH2ZM

Most Hated Champion: This Car PISSED OFF The Entire NHRA - Bill Grumpy
https://www.youtube.com/watch?v=4l7xD9m1wNk

The Shocking Truth Behind Don Garlits Deadly Swamp Rat XIII
https://www.youtube.com/watch?v=GOvemrsBv-k