 |
1966 was the single best-selling year the Pontiac GTO ever had — and it’s also the year Pontiac quietly buried one of its rarest factory engine options, a Ram Air camshaft package that replaced Tri-Power on paper but never really won buyers over. Barely 35 were built to factory spec. Here’s the story behind the GTO’s forgotten sales peak.
Chevrolet’s Mark IV big-block started as a truck engine and ended up terrorizing quarter-miles from Camaros to full-size Biscaynes. The 396, the 402 sold under a different name, and the legendary 427 all trace back to the same basic architecture. Read on to see how one engine family covered such wildly different cars.
The 1969 Camaro SS’s official order sheet topped out at a 375-horsepower 396, but a separate, little-known path let buyers get a factory 427 anyway — through Chevrolet’s COPO ordering system or through tuner dealers like Yenko and Baldwin-Motion. The rarest of those, the aluminum-block COPO ZL1, was built in tiny numbers and now ranks among the most valuable Camaros in existence. It’s proof the fastest ’69 SS wasn’t always the one on the brochure.
Between 1965 and 1967, Pontiac transformed the GTO from a clever option package into the standard every other muscle car would be measured against. Stronger brakes, a new hood scoop, and an engine that grew by more than 60 cubic inches turned three model years into a legend. Read on to find out how Pontiac stayed ahead of Detroit’s entire muscle car field.
Chevrolet’s 348, 409, and 427-cubic-inch “W series” engines look nearly identical from the outside, sharing interchangeable heads and the same basic block architecture — with one telltale difference: dipstick placement. Introduced in 1958 as Chevrolet’s first true big-block V8, the family climbed from a 250-horsepower Turbo-Thrust up to a 350-horsepower Special Super Turbo-Thrust before the 409 and 427 took over as the brand’s flagship big-blocks. Read on for how to tell these engines apart and where each one fits in Chevrolet’s horsepower history.