There is another rocker arm philosophy to consider.
As the valve opens more, the spring load becomes greater. This argument postulates that, at greater spring loads,
the rocker should approach the valvestem more perpendicularly, so there is less side loading on the valve guides.
To achieve this, the pushrods should be "too short", so that there is more roller scrub (towards the exhaust side)
while the valve is just opening and spring loads are lower.
Geometrically speaking, there is a greater scrub distance than the "mid lift' philosophy. But less guide wear. Diagram showing low-pivot approach as described above on the left and mid-lift approach on the right
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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