Scrutineering request: Cam Lift
#31071 from Charles Baader · Not recommended · Minutes (2021-10 Fastrack)
Thank you for your letter.
How valve lift is to be measured on all Prep Level 2 cars is already defined in 9.1.5.E.2.f.7:
“Where maximum valve lift is specified, valve lift is measured at the valve with zero lash or clearance.
There are a few exceptions to this rule, where a spec line specifically allows for valve lift to be "measured as raced - w/
lash". These spec lines are from the original "Limited Prep" classifications that were made, many years ago, and that was the
process/ruling at that time. As the "Prep Level 2" ruleset matured, and more waves of cars got classified to it, this measurement
method was re-evaluated and changed to the current rule. Previous classifications have since been allowed to "grandfather"
their original rules. Just as competition balance is monitored between Prep Level 1 and Prep Level 2 cars, the same is true for
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these original "pseudo-Limited Prep" classifications. Reverting this valve lift measurement process again would not make
building these cars any easier, would not balance the performance potential of the field, and just tempt competitors to re-do
their cam designs to chase an extra few thousandths of lift. Due to all of that, this request is not recommended.