340 xhead spring shimming, height and pocket question(s)

Only reason I can think of using shims(in this case) is to increase spring psi?
Without the shims and with my shitty measuring skills the inst height measurements are already tighter than the 1.700" spec.
Gotta measure to that many decimals with my lousy measuring lol.
I'll compare oem springs vs 942 side by side.
Thanks

Bodyperson said

Can’t know why someone would do that. I do know you are one anal MF if you are measuring spring shims down to 1/10000 of an inch. Lol :poke:

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