Unit, they sure looked hardened to me. All of the bearings are made out of steel. The only thing that's aluminum is the body of the rocker. I wonder if Summit is going to get a lot of calls about that "advice".
Rick, I don't buy it for a second. With all the bends that air has to take getting into the combustion chamber, there is no way a vortex would even persist long enough to "improve fuel atomization". I also don't buy that air velocity is increased. This is clearly targeted at people who think like ricers.
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351W 89 Mustang GT Convertible