He took a set of Vortec right out of the box and clamped them down to his Superflow bench. With 230-cfm max flow, these heads are actually ... notes listed in the charts to see what mods Mondello ...

The restrictions include a 362ci (maximum) iron block, the first GM Bow-Tie Vortec big-port cylinder ... and 77cc exhaust ports (see Flow Chart). The head is also machined for 3/8-inch screw ...

and dozens of dyno tests have shown that the often overlooked 706 Vortec head can give you great performance. These cathedral-port offerings come stock with great flow and, unlike many truck heads ...