its chevy's small block 323 cubic inch v8 engine. its a vortec because the cylinder heads flow more air and the intake bolts screw through the intake straight down (i) rather than on an angle(/) into the block. one liter equals 61.02 cubic inches, so you take 5.3 x 61.02=323.406 so its a 323ci. Rounding of answers sometime is used to make up difference. For example Ford'S 302 is actually a not a true 5.0L, its a 4.9491L, take the 302/61.02
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