![]() ![]() If you just want to win races while spending the least amount of money, get a modern Chevy LS small-block. The stock BBC heads are massive, but in aluminum form, this giant footprint on the fire deck adds stability and more flexibility in port design which the aftermarket has taken full advantage of. This favors the big-block Chevy, a fact somewhat hidden by the reality that the big-block Chevy cast-iron heads and intake are super heavy, though they are easily replaced by lighter aluminum. ![]() A short-stroke engine doesn't need as tall a deck height to make the same cube-count and will typically weigh less, setting up a lighter-is-better argument. Big-Block Specs" chart shows stock bore, stroke, and approximate engine weight, and here you'll note that some engines have larger bores and shorter strokes (oversquare) while others have smaller bores and longer strokes (undersquare). If increasing the bore and increasing the stroke both provide more cubic inches and presumably more power, does it really matter how the factory went about increasing the displacement? It turns out, that does matter. Already, you've learned that the size of the air pump isn't a marker for how well it pumps air. The 455ci Olds might have more cubes, but a 327ci (5.3-liter) LS is the better air pump of the two. Moreover, the cost of parts may make building some engine brands cost-prohibitive at larger sizes and higher hp, so while you may crave a 455ci Oldsmobile big-block, for example, you may be better off with a new-era Chevy LS at half the cost per-hp. The availability of these varies wildly for different engine families, when it exists at all. First is the availability of aftermarket cylinder heads with high-flowing port shapes and large valves. small-block, things aren't equal, and our basic argument of "bigger is better" kind of hits the guardrail in a few places. Unfortunately, in the argument of big-block vs. The bigger the displacement of the pump, the greater the potential power when all things are equal, the bigger the engine, the greater the power output. Engines in their simplest form are air pumps.
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