I have never owned a dual pattern cam. I have been 9.60s 1/4 mile with a junkyard headed Stroker SB, LA 587 smog castings, in 3000+ car with 727/Dana 60. Racer Brown STX-22 SFT Cam was actually made in 1971. In another tank car, 4200# 79 Chrysler "300", with another stroker SB with same junkyard 587 heads and a Racer Brown STX-21 SFT cam, has been 11.20s at 118 mph. In another car with a Indy SR headed 512 c.i. BB with another RB STX-22 SFT cam, have been 8.50s at 157mph. Car is a 89 Chrysler LeBaron and weighs just under 2600#. Have never lost a lobe on any engine in any of my cars, except one that was a used cam, someone gave me, with new lifters.

As someone in earlier post said already, Call Jim at Racer Brown. He will set you up with a perfect camshaft.