Excerpt from On All Cylinders July 15, 2016, automotive blog post by Stephen Kim.
Running 6.80s at nearly 210 miles-per-hour, today's 275mm drag radial door-slammers incinerate the quarter-mile thanks to obscene levels of airflow and grip. Producing close to six horsepower per cubic-inch requires immense cylinder pressure that can split blocks, blow head gaskets and melt pistons in a jiffy. Fortunately, the aftermarket has methodically eliminated each of these weak links in recent years. While enhanced short-block durability is obviously a good thing, it places an even greater burden on the cylinder heads to keep all that pressure sealed inside the block. To meet the demands of today's boost-hungry race engines, casting technology has evolved tremendously to spawn a new crop of incredibly durable cylinder heads.
While Edelbrock is best known for its extensive line of cylinder heads and intake manifolds, over the last 25 years, the company has quietly established one of the most sophisticated foundry facilities in the country. Initially, the foundry's primary focus was elevating the quality of its street castings, but as racers continued pushing the limits of durability, Edelbrock developed many key technological advancements in an effort to create the strongest race castings in the business. In fact, when engineers realized that they had reached the limits of their first foundry, Edelbrock built a second foundry in 2007 better suited to the low-volume manufacturing requirements of its race cylinder heads.
The combination of old school know-how and modern technology allows Edelbrock to dynamically adapt its casting process as circumstances dictate.Read More