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Old 10-24-2007, 01:26 PM
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JCoop JCoop is offline
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Join Date: Feb 2006
Location: Glenwood Landing or Southampton, NY
Cobra Make, Engine: Superformance, FRP460 Big Block
Posts: 975
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The reason I thought motor mounts is because for the longest time, my SPF BB would break the RH sidepipe mounts and vibrate at around that same RPM; whether driving in gear or in neutral at rest. The 3rd time I welded the mounts, I decided to change the motor mounts to poly (from Dennis O.) and haven't had a problem since. Didn't even realize it but the original rubber mounts were cracked from "spirited" revving and driving.

Worth a check, anyway. Cheers and good luck!
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