This added roughly another $160 to the price of the heads but allowed us to use 1.6:1 roller rockers to level the playing field against the other heads in the test. We anticipated this issue and used a set of Scoggin-Dickeymodified Vortec heads with the valve guides machined for additional clearance and fitted with better, Z28-style valvesprings. In stock form, the retainers hit the seals with valve lifts above this 0.450-inch figure. The main limitation with these heads in pure stock form is their inability to utilize valve lift above 0.450 inch. These heads were only used on a few models of Vortec truck engines, but their longevity is ensured because they flow so well. The production-based iron Vortec head represents one of the best budget investments for power for the small-block Chevy.
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