The Vortec heads were decked 0.045-inch to yield 55cc chambers, then installed with Fel-Pro's 0.015-inch-compressed-thickness head gaskets (PN 1094) to achieve a bit over 10.0:1 compression. The steel-shim gasket has a precision rubber coating-for long-term use, install them with sealant.The Vortec heads were decked 0.045-inch to yield 55cc chambers, then installed with Fel-Pr Another issue with the 305 S/R Torquer heads is that the valve angles are altered to assure no valve-to-cylinder-wall clearance problems. That may mean that larger 2.02/1.60 valves can be installed-but there's a heavy emphasis on the may, since we haven't tried it. The heads come complete with 1.94-/1.50-inch valves and valvesprings, and have screw-in studs, which the Vortec heads don't. World's 305 heads use conventional valvesprings; the Vortec units require new ovate-wire springs in a smaller diameter. We tested the World 305 heads on our dyno mule along with the standard Victor Jr. intake, the Holley 750, and the Comp Xtreme Energy 262 cam. In this configuration, we made 297.6 hp at 5,500 rpm and 308 lb-ft at 3,900 rpm-healthy for a little engine. These numbers can't be compared fairly to the 325-horse/316 lb-ft numbers with the Vortec heads because the intake-manifold design was slightly different. For more information, contact World Products, Dept. CC, 35330 Stanley Dr., Sterling Heights, MI 48312-2654, 810/939-9628, www.goracing.com/world What'll It Cost Me? The total cost of the Vortec cylinder-head package depends on your small-block's vintage. If you already have '87-and-up center-bolt valve covers and guided rocker arms, you can put this package together for about $1,575. Figure on spending up to $125 more if you need the extra parts and want to buy them new. You could save money scoring good late-model parts from a salvage yard. SOURCES Comp Cams Inc. 3406 Democrat Road Memphis TN 38118 800-999-0853 www.compcams.com Edelbrock Corporation 2700 California St. Torrance CA 90503 310-781-2222 www.edelbrock.com Summit Racing Equipment PO Box 909 Akron OH 44398 800-230-3030 330-630-0240 www.summitracing.com Holley Performance Products 1801 Russellville Rd P.O. Box 10360 Bowling Green KY 42102 270-782-2900 www.holley.com GM Performance Parts P.O. Box 33170 Detroit MI 48232 800-577-6888 www.gmperformanceparts.com Carriage Motor Co. 41872 Motor Car Pkwy Temecula CA 92591 909-694-6060 Fel-Pro/Federal Mogul Detroit MI 800-560-1400 www.federalmogul.com Hooker Industries Inc. 1024 W. Brooks St. Ontario CA 91762 909-983-5871 « | 1 | 2 | 3 | View Full Article By Marlan Davis Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!