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Originally Posted by Excaliber
Are some jets actually 'tapered' to increase velocity effect? If so, then drilling a stright hole might not be a good idea.
Anybody got any input on this confusing topic?
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From Holley:
"Holley jets are broached, flowed, and stamped according to flow rate. NEVER drill jets, as this seriously alters flow characteristics. Stamped numbers are reference numbers and DO NOT indicate drill size."