Join Date: Jan 2000
Location: Houston, TX USA
I believe it was Car Craft that did a header comparison a while back. They started with the shorties, and then went on to diff. primary sized full length headers. What they found was that the shorties produced the most torque, and HP, up to around 5,500 where the long tube headers began to show an improvement from there on up.
Think about this for a moment-how often do you drive at 5,500RPM? Obviously you spend more time in the lower RPM's and the shorties have proven to be dominant over long tube headers for 90% of the driving that most street cars do.
I don't know if this carries over to BB's or not, but it was an easy choice for me to go to shorties after scraping my long-tubes until there were holes in them. By the way, I am lowered 2" in the front, and 1" in the rear.
1969 383CI, T-56, 12 bolt-3.31 posi, 13" C5 Rotors, PBR Calipers, rear disc system..