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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.
A 1969 L88 Corvette, one of only 116 built and deliberately underrated by Chevrolet at 430 horsepower, takes on a 1972 Oldsmobile 442 W-30 officially rated at just 300 horsepower. A commenter who says they worked at Olds Experimental during this era insists that number was never accurate, and that a genuine W-30 could beat Mopars, GTOs, and Corvettes regularly. The race backs up the claim. Watch the run and read the insider testimony in the comments before trusting either car’s factory rating.