header size

[Don Dulmage <big-d@xxxxxxxxxxxx>]

Our rule for header size which never gets us in trouble is the dia of the primary pipe should be as close to the diameter of the exhaust valve as possible. then all the calculations work. Bigger (oversize) headers must be longer to work at the same RPM and smaller (undersized)headers , well anything smaller than the exhaust valve diameter is too small in my thought. For instance with a 1 .74 exhaust we use a hooker 1 3/4 (We often lengthen the primary anyway because they are tuned above our engines sweet spot. ) for 1.81 we use 1 7/8 for 1.88 we use 2 inch. Like everything else we have discovered HUGE power comes when the combo is matched. "Bigger is better" thinking is always a power hurting  decision. Like Earl says though too small will kill ya, everytime. 
Don
Author of
Return to Deutschland (True Adventure)
Old Reliable (Mopar)
http://stores.ebay.ca/Don-Dulmage-Enterprises
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