This is where you get into one of those “ask 10 people...... get 10 answers” situations.
Personally, I’d never try and run a cam like that Lunati with 120 on the seat.
The specs in your book are a little lower than mine.
Perhaps MP started getting that spring from another supplier, which could account for the differing specs.
Perhaps one of the books is just wrong....... or maybe they’re both wrong.
Even your book shows a rate of 540lbs/in....... which imo is crazy high for a SFT cam.
I trust the numbers from my tester....... which often disagree with specs in a catalog.
Which is why I always suggest having them tested so you know what you have.
Looking at some other numbers in your chart, the specs/loads for the listed heights are incorrect for the 933 spring.
The numbers for the 077 springs at the heights listed are also way off.
I don’t really have much confidence in charts from Mopar books.
