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Rearend Gear ratio change

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Old Feb 17, 2011 | 07:50 PM
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yedister
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From: Perth Amboy New Jersey
Default Rearend Gear ratio change

Two of my buds are building different engines. One is a 572 BBC and 468 SBC both street car and fuel injection. Both Vettes have 3.08 rearend ratio, 4L80E transmission. Big Block cam is 270/278@.50, Small Block cam is 268/274@.50. does the rear gears have to be change to avoid the plugs fouling under low rpm driving? Is there a method of determining when to change and how much change would be required?

Thanks,
Yedi
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