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The Chevy SB2 heads are good for a dozen or more races before they arecycled out. They also require a lot of attention between races. Thecylinder head department alone employs 11 people.
How They do it in the Big Leagues

The Chevy SB2 heads are good for a dozen or more races before they arecycled out. They also require a lot of attention between races. Thecylinder head department alone employs 11 people.  View Related Article