305 Chevy Vortec Cam Specs

by Manny Jeter
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The Chevrolet 305 Vortec engine was built by GMC. The Vortec engine was featured on the 1996 GMC Sierra C/K 1500. The small-block Chevy (SBC) engine is now sold on the aftermarket. Complete and incomplete SBC engines can be purchased. The incomplete version should be purchased if you wish to make modifications or improve the performance of the engine. Modifications and adjustments should be done by a professional. The engine has been praised for having a large amount of power in a small frame.

Camshaft Specifications

The Chevy 305 Vortec engine's intake valve measures 1.94 inches. The engine's exhaust valve measures 1.5 inches. The intake manifold has a .325-inch sealing surface. The engine's rocker arms are self-aligning and measure 1.6 inches. The Chevy 305 Vortec's valve springs measure 1.241 inches in outside diameter. The valve springs are 1.7 inches in height and have 80 lbs. of spring pressure. The average spring rate is 256 lbs. per inch. The total valve lift is .43 inches. The combustion chamber's size is 4.03 cubic inches. The Vortec heads are cast iron and have an intake port-shape designed to induce a swirl for turbulence.

Engine Dimensions

The Chevy 305 Vortec engine uses a valve-in-head (VIH) valve configuration. It has a total of 16 valves and eight cylinders. The engine's displacement size measures 5012 cubic centimeters, 305 cubic inches or 5 liters. The Chevy Vortec 305 engine's bore and stroke is 3.74 inches by 3.48 inches. It has a compression ratio of 9.4 to 1.

General Specifications

The Chevy 305 Vortec engine uses a sequential electronic fuel-injection (SEFI) system. The engine runs on regular gasoline. The fuel tank has a capacity of 25 gallons. It has a peak horsepower of 230 hp at 4,600 rpm. The engine has a peak torque of 285 ft.-lbs. at 2,800 rpm.

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