Here are four different production GM small-block heads. From left to right is your run-of-the-mill GM head; an LT1 aluminum head; a camel, or double hump head; and a Vortec head. Vortec heads are the most popular and efficient, offering the “best bang for the buck” with large intake and exhaust runners and a very efficient combustion chamber, while camel hump heads are the most popular with old-school hot rodders for their large intake runners. The LT1 and Vortec show the heart-shaped “double quench” design in their combustion chambers. Some of the few drawbacks to the Vortec heads are the relatively thin casting (which means they crack when they get hot), press-in studs (which can be upgraded), and some clearance limitations when using a high-lift camshaft. The camel hump heads have lots of metal making them more shapeable for the experienced head-porting expert.