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Chamber modifications are not allowed, and for Wade's combination, the minimum volume is limited to 54.9 cc. In Stock, intake and exhaust runner modifications are also illegal. On the 283, port volume is limited to a maximum of 140 cc intake and 60 cc exhaust. Under the rule constraints, the flow numbers over 170 cfm on the intake and 140 cfm on the exhaust require considerable expertise. View Related Article
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