Spring pockets on Vortec heads:
1. Enlarge pockets to a maximum of .100" for valve springs that are 1.350" diameter.
2. Do not machine the spring pocket depth in order to increase valve spring assembled height.
3. In order to increase spring height, use + .050" locks and/or + .100" long valves.
If there is another way to use Vortec heads, please advise.