When building a car for racing, every small change that you make can shave a fraction of a second from your time, which can potentially be the difference between first and second place. Try Chevy double hump heads to give you an edge when looking for stock cylinder heads. Also called camel hump heads, their name comes from their identifying marker of two humps connected by a straight bar. But there were some modifications made over the course of production, so not every camel hump head offers the same performance capabilities. For example, some models offered higher ports, which are important because the height creates a larger cross-sectional line as well as creates better airflow. The difference in height from model to model can vary ever so slight by just hundredths of an inch, but any difference can affect your vehicle's performance. To determine which model can offer the best performance, research the part number's specifications. Chevy double hump heads are a great addition to stock racing cars, and you can find the right one in the large inventory available on eBay.