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If the rockers were too loose (like you had no preload) then yes that could cause damage, but if your rollers are chewed up then you better look at your cam lobes!
Those springs should be more then enough. I've set up a few cars with 306 and GM847 cams and sprinning to about 6600 with no issues at all, no valve float/bounch or compressed lifters.
The rev kits are useful but you can do better with proper springs. You would be better off going with double springs, but based on the lift of the cam ( I don't know what your running ) you may have to get the heads machined to accept proper springs. The Rev kit was really useful in classes when you had to run stock springs or if you couldn't fit proper springs in the heads. Neither of those are real issues with your heads.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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