08/31/2026
Every engine builder on this page has a personality. Smokey Yunick was a showman who read the rulebook better than the people who wrote it. Ed Pink was a machinist who measured in ten-thousandths. Ed Iskenderian was a marketer who made camshaft ads entertaining. Bill "Grumpy" Jenkins was an engineer who didn't have time for your conversation. Cornell University. Engineering degree. A no-nonsense disposition that left zero room for idle chatter at the track — because every minute spent talking was a minute not spent finding the next tenth of a second. The nickname wasn't marketing. It was accurate. Jenkins was grumpy because he was thinking. And what he was thinking about — while everyone else was socializing — was how to make a small-block Chevrolet beat a big-block in a class that everyone assumed big-blocks would own forever.
Jenkins won the first Pro Stock race in NHRA history. The 1970 Winternationals at Pomona, California. The class had just been created — NHRA's answer to the demand for a professional drag racing category featuring full-bodied production cars with production-based engines. Jenkins drove his "Grumpy's Toy" 1968 Camaro powered by an all-aluminum ZL1-based big-block V8 — approximately 430 cubic inches — and recorded the first nine-second pass in Pro Stock history: 9.98 at 138.46 mph in the first round of eliminations. He won the inaugural event. Then he won the next one — the Gatornationals. The first two Pro Stock races ever held, both won by Bill Jenkins. The Father of Pro Stock didn't just name the class. He owned it from the first flag drop.
Then Jenkins did something nobody expected. He abandoned the big-block. In 1972, while every competitive Pro Stock team was running the largest displacement the rules allowed — 427s, 440s, Hemis — Jenkins showed up with a Chevrolet Vega powered by a 331-cubic-inch small-block Chevrolet. Three hundred thirty-one cubic inches against engines with a hundred more. The Vega weighed less. The small-block revved higher. Jenkins understood what the Z/28's DZ 302 had proved in Trans-Am and what every road-racing post on this page has documented: in a class with weight breaks that favor lighter cars, fewer cubic inches in a lighter package can beat more cubic inches in a heavier one if the engine builder extracts enough power per cubic inch. Jenkins extracted enough. He won six of eight NHRA national events in 1972 with the small-block Vega. The "Giant Killer" campaign — a small-block beating big-blocks in professional drag racing — became the most famous David-versus-Goliath story in NHRA history.
The engineering precision was the competitive advantage. Jenkins understood that winning Pro Stock required more than peak horsepower — it required consistency, efficiency, and a systems approach where airflow, camshaft timing, carburetion, ignition, gearing, weight, and vehicle setup all worked together. His cylinder head development — meticulous port work, optimized valve geometry, matched intake runners — produced small-block heads that flowed air at rates that approached big-block territory from physically smaller ports. His lightweight component selection — aluminum where rules allowed, titanium where budget permitted — reduced reciprocating mass and allowed higher RPM without sacrificing reliability. His chassis tuning — including an innovative weight-transferring front suspension, the "slick-shift" transmission for faster gear changes, and the "cool can" fuel cooler that reduced intake charge temperature — became standard equipment across Pro Stock within a decade. Jenkins didn't just build fast engines. He built complete systems. Every component supported every other component. Nothing was wasted. Nothing was decorative. Everything served the elapsed time.
In 1972, Jenkins recorded 250 consecutive passes without missing a shift. Two hundred fifty launches, two hundred fifty first-to-second shifts, two hundred fifty second-to-third shifts, two hundred fifty third-to-fourth shifts — all with a manually shifted four-speed transmission, no air shifters, no automated clutch management. The mechanical precision of a man who had studied engineering at Cornell applied to the physical act of moving a shift lever four times per run, every run, for an entire season. A missed shift in Pro Stock costs two-tenths of a second. Over a season, Jenkins's shift consistency alone was worth multiple round wins against competitors who occasionally got it wrong.
Across his career: thirteen NHRA national event victories as a driver. Sixty-one national event wins as an engine builder for other drivers' cars. Five NHRA Pro Stock championships. Three AHRA championships. His influence reached NASCAR — Donnie Allison's pole-winning engine for the 1975 Daytona 500 was Jenkins-built, and Mike Swaim's 1987 Busch Series Daytona pole car ran Jenkins power. He was inducted into the International Drag Racing Hall of Fame in 1993, the Motorsports Hall of Fame of America in 1996, the Hot Rod Magazine Hall of Fame in 2000, and the International Motorsports Hall of Fame in 2008. NHRA ranked him eighth on its list of the fifty greatest drivers in the organization's first fifty years — and that ranking undervalues him, because Jenkins's greater contribution was as a builder, not a driver. The engines he built won more races than the car he drove. Bill Jenkins died March 29, 2012. His credo was seven words: "If it's worth doing, do it right." The grumpiest man in drag racing was also the most precise. And the precision won more races than the personality ever lost.
