Here's a few pics of one of my rides: '77 Iron Sportster, Pro-Street, 13:1 93ci (3.5"by 4-13/16") RedShift 550 cams, Baisely full roller valve train., Baisley cylinder heads, S&S Super "D" race-prepped carb with twin Thunder-jets (the venturi measures 2-1/4"), dual plugs with homemade DIS (4 coils) ignition.
The trans is a special drag race close-ratio 4-speed that is electric over air shifted with an adjustable slipper clutch. The original frame has been stretched, raked, re-inforced and lightened. The rear tire is an old Michelin 160 road-race tire. In the day that was a wide tire!!
I made from scratch or reverse engineered virually every part on this bike. Some obvious are: two-into-one header, tank, handle-bars, 'dentist' mirror, rear fender (was a front dresser fender turned backwards and widened), crank case evactuation system, seat etc, etc.
I built this bike about 13 yrs ago and have raced it occasionally. It is street legal and it is a BEAST!! There is nothing that equals the acceleration of a big, long stroke engine. When you nail it, you'd better have it pointed in the general direction that you want to go because the higher the RPM's the harder it pulls!
This is how drag race / custom Harleys looked back in the day. I feel a little jypped sometimes because I was doing all the s--t you see on TV now 15-20 yrs ago when some of those guys were still in junior-high!! I guess most main-streamers then were not interested in custom Harleys on their television!!