Re: Tuned vs Non Tuned Headers
The term "tuned headers" is a marketing term and is about as outdated and non-descriptive as categorizing cams as "3/4 Race and Full Race".
A "tuned header" usually describes a header that has equal length (or nearly equal length) primary tubes. We all know that primary tube diameter, tube length and collector design all go into the receipe for a tuned header. Now, the chore here is to get the header "tuned" to the RPM at which the engine makes the most horsepower. A "tuned" header is actually in "tune" during a very short RPM band. (This RPM band is even shorter in a high RPM Pro Stock of Competition Eliminator class car.)
In summary - no, a "tuned" header is not at all necessary in a street or street/strip application. This is because a steet or street/strip vehicle needs to produce HP and torque throughout a wide RPM band, therefore the header would be in "tune" for a very minimum amount of time.
64 Chevelle Malibu Sport Coupe (original owner) car now has 427" BB, Jerico 5-spd. trans., Dana 60 rear end.
SAE Member (25+ years)
ASE Master Certified Engine Machinist
AERA Certified Professional Engine Machinist