These include the pioneering overhead valve 331 cu in (5.4 L) cu in. RPM (calculated) Calculate Optimum Runner Size and Length. Compression Ratio: 11.124 to 1 Working it out To find the compression ratio (CR) you divide the total swept volume with the total compressed volume. Common Pontiac Engine Displacements : (click the button for that bore and stroke for each engine) Click the following to add to the bore size. The vavle chamfers on a cylinder bore of block, etc. Engine Displacement (cubic inches only) cubic inches. The extra volume in head gasket, where the bore opening is not a perfect circle. Any engine builder will agree that this is a very respectable accomplishment. Compression ratio, 8.5:1, 10.0:1, 10.5:1. To find the rpm at which peak torque occurs for a given intake runner / engine. In this case these gentlemen not only met their goal of making 500 hp from a naturally aspirated small-block 331, but the horsepower/cubic-inch ratio ended up being 1.53 hp per cubic inch. Persistence and the willingness to try seemingly useless adjustments and changes can often make the most significant changes in power. Two days' worth of dyno testing netted just 25 hp and a variation of 13 lb-ft of torque. To make 500 hp and 420 lb-ft or torque from 331 ci, Julio Mayen, John Da Luz, and Steve Bruel had to put every ounce of their wits into the end result. According to the factory, no basic change was made to get the additional 20 horsepower over the 1953. Horsepower baselined at 480.5 and peaked at. compression ratio and 331- cubic-inch displacement. Despite every single change made to Elvira's 331ci small-block, torque never varied more than 13 lb-ft across 14 dyno pulls. When you study the numbers above, it becomes clear you're only going to make just so much torque with a given amount of displacement.
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