Not Ranked
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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Ray
New York
SPF#1052 11mpg
CAV GT40 MONO29 9mpg
'94 35th Anniversary Rover Mini Cooper 32mpg
'01 MB CL600 V12 18mpg
'08 Volvo S80 18mpg
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