How much of a difference is there between the RPM head verses the E Street? Performance wise. The E Street is about 250 -300 lower in price. Basically zero difference. The only real difference between them now is some tiny about of blending and the valves. The 84cc E Streets also have the spark plug holes straight instead of angled. Is the difference in valve seat materials a non-factor for the typical usage of both series?
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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