Thats why i dont run them anymore, more trouble than they are worth. You could put in a bigger cam that would solve the to much vacuum problem
75bird 7.41 1/8mile at 92mph street car
73Ventura 11.88 at 113 streetcar
69GrandPrix 12.64 at 107 tow car
65GTO 10.14 at 129 tri-power dragcar
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