i run the butler e-heads with 73100 springs and a 3318/3319 comp cam on a 106 lsa 1.7 intake rockers and 1.65 exhaust
no problems
cam is done about 5700 anyway, so any rpms past that isn't a big deal for me
i am chipped to 6200, have gone to 6400, but can tell after 57-5800 cam is done (should say my combo is done with peaking/increasing power as Rpms go up) (its "windmilling")
i dont experience any valve floating issue
if i go more lift i'll need to change springs
but supposedly these springs are good for hdy/flat/hyd rollers
mine are 10+ years old now
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