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I read a lot of stuff bout the vortec from alot of places and they all say 2.02 vavles dont help stay with 1.94 just go to 1.60 on exhaust vavle but before I would spend all that money on vortec heads I would buy a aftermarket set of heads that are alot better vortec are not a real good head unless u talking stock stuff they better than most stock gm heads but thats not saying much by time you buy the head port polish have spring pocket clearence for a real spring. Buy all new springs and vavles Do screw in studs u could buy set of dart heads or some other aftermarket head that will outflow them and make more power
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