The 706 Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM (semi-permanent mold) made, while the 862 heads are sand-cast. The SPM ...

The clear winner in the iron head category was GM's Vortec, receiving more than 10 percent of the total vote. We know that the Vortec has a good head design, and it didn't take us long to make our ...

We've been getting a ton of mail with questions about how and when to modify the Vortec small-block iron heads—so much mail that we decided to condense all the Vortec information into one ...