Chevy Small Block Vortec Cylinder Heads Specifications - Heads Up!
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The first swirl port heads were installed on '87-'95 TBI 305s and 350s. The radical ramp in the valve pocket works well to swirl the air/fuel mixture, increasing low-speed torque and fuel economy. Although the intake port volume is large for a small-block -- 185 cc's -- they are not particularly suited for producing horsepower in the upper rpm range. View Related Article
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