A question. Did ESPN cover the swept back headers innovation or did Beckman tell the world for the first time in his NHRA dot com interview?? Maybe I missed it.
The first time I heard about them was on ESPN. They said the headers were laid back to 32 degrees, instead of the conventional 40 degrees. I'm surprised NHRA stood for it without a fuss, and I can't believe laying the headers back 8 degrees would make nearly a tenth of a second ( and 7-8mph) difference on a car that was already running high 3.90 ETs. I'm guessing some clutch work went along with the header modification.
Back when the Funny Car ET was getting smashed week after week, Virgil Hartman posted a very detailed description of how an "Auto Flow" clutch system could be lowering the ETs.
EDIT: Here you go.
http://nitromater.com/threads/prock-auto-flow.38702/#post-346099
In Dallas, Dexter Tuttle's dragster had swept back headers. They looked like mini funny car headers, they shot the exhaust around the edge of the tire.