Quote:
Originally Posted by Lenny5160_v2
Considering how the rule is worded, could it be argued that an increase in lifter diameter is not a "performance-related modification"? As in, the modification should increase strength/reliability, but not performance.
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Remember max velocity is limited by lifter diameter. So a larger lifter diameter lets you use a cam with a greater max velocity. There is a performance increase in doing that.
PS If you look in the Comp Cams Master Lobe List you will see that they have a number of lobe profiles that only will work with a .904" lifter.
Stan