John, Strike force heads are marketed by a company called RPM. They are from the south. My tires on the rear are 9.00/850x15. Ford 9inch housing with 4;56 ratio. I leave the line at 1,800 RPM;s. I usually run in the low 1.50;s for a 60 foot time, but I do get into the 40;s. Come to the Reunion in aug and see the car,run! Thanks The Dutchman [img]<<GRAEMLIN_URL>>/
[/img]