Thread: USAC "BIG" events... clarification?
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5/28/08, 2:19 PM   #33
Re: USAC "BIG" events... clarification?
DonRacer
DonRacer is offline
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Join Date: Aug 2007
Posts: 117
 

Quote:
Originally Posted by Rex W. View Post
TF & AA/FC are limited to 500 cid.
Also limited to 90% nitro, up from 85% recently.