When MP used to sell the blue versions, they were listed for Stag IV / V heads. They were nice because you could run this style in the 1.6 ratio and the additional offset meant you didn't have to worry about pushrod clearance with OEM iron heads.
2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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