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The 400 small-block is mostly remembered for something almost embarrassing: which parts from other small-blocks will not bolt onto it. This guide traces Chevrolet’s 4.0-inch bore small-block family — the race-bred 302, the ubiquitous 350, and the siamese-bore 400 — and explains the external-balance quirk that catches out first-time engine swappers. Read on to find out how to tell these engines apart before you buy or build one.
The third-generation Corvette ran for fifteen model years without a full redesign, longer than any generation before or since, while watching horsepower ratings collapse under new emissions rules almost the entire time it was on sale. Read on to find out how a car built on a Mako Shark II concept survived that transition — and which rare option is worth more than most entire classic cars.
Chevrolet’s 350 small-block went through four dramatically different personalities in barely a decade — from the 425-horsepower NHRA-rated LT-1 in 1970 to a computer-assisted, 190-horsepower L81 just eleven years later. Tracing the L46, LT-1, L82, and L81 in sequence lays out exactly how emissions rules and changing priorities reshaped one of GM’s most important engines. Read on for the full breakdown, casting numbers included.