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the real problem with the '933 spring is they get into coil bind rather quickly and are a high rate spring.


As you said, not a bad choice for a fairly limited selection of cams, and not really a good match for anything “modern”.

Back in the day, the MP engine manual was pretty keen on making sure there was “plenty” of open spring load.
Of course, that was when cams going flat wasn’t as common as it seems to be currently.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads