It doesn't really stiffen the rotating assembly. What it's job is, is that it keeps everything together if there is a failure like cracking a block. Aluminum ones are supposed to be better because they absorb vibrations. Me personally, am putting one on my motor for insurance. ~Brian
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1989 Black Mustang GT Hatchback, Underdrive Pulles, Electric Fan, Cold Air Intake, Headers, Offroad H-Pipe, Magnaflow catback, Steeda Tri-Ax, Fluidyne Aluminum Radiator, Timing at 14*, 3.73's
Coming not so soon: 408w
Ricer Hater's Club Member #59
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