While I haven't seen girdles for center bolt heads, they may be out there. Another option is to get larger rocker studs to help with stability if you can't run the girdles.
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1984 Camaro: 350 Auto, Global West Suspension, Baer Brakes, CTW Wheels
1989 GTA: Bolt-on L98. Global West Suspension, full Magnaflow exhaust, Wilwood Brakes, CTW Wheels
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