Roller Rockers are they needed

Roller rockers are good for 15-35hp depending on the type of roller you select, pivot ball rockers with the roller tip are better than stock and full rollers such as the comp pro-mags i use are the best. Stock rockers are tough on the studs and tend to push the valve stem sideways against the guide causing premature failure of the guide and seal. IMHO it does not matter what type of engine or how much rpm you are turning, Roller rockers are a sound investment and worth their weight in gold. Harland Sharp makes some good rollers but i spent a little more and got the Comp Pro-Magnum rollers, guide plates are mandatory when using full rollers and depending on how much spring pressure you have screw-in studs may be in order.

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I second that... but Comp Pro Mags also come with self guiding tips now, so you can skip the guide plates. But screw in studs (7/16) are WAY WAY better then the pressed in type.. When I redid my motor (89 5.7 ltr), I went ahead and changed everything over to rollers (roller cam, lifters, rockers, double row chain).

Just wish I could have used a gear drive, but that dumb knock sen. wont allow it.

HDS

i can justify 7/16 studs with spring pressures over 140 pounds and/or lifts over .500 and/or rpm over 6500.... otherwise i am comfortable with 3/8 studs and girdles. even though i am swapping in a nasty solid roller and heavier springs soon i will still feel comfy with the 3/8 studs and girdles.

BTW, the gear drive is trouble free and whines quite nicely but the exhaust note buries it above 2500 rpm.