Trick flow heads: different installed valve height

gzig5 said

So what kind of variation in pressure did you measure?? There’s variation in everything it’s just a matter of how much

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20-25 lb/in difference on the seat2s. The springs specs say 420 lb/in rate but they checked at just over 430. Tested seat pressures ranged from 160-180ish on springs that the paperwork says are 138 @ 1.95 installed height.