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I've read in Chevy High Performance that one of the best buys for a ZZ4 is the GM Performance Roller 1.6 rockers. They will fit under stock center-bolt covers without mods. These are self guiding rockers which is a necessity with ZZ4 heads. If you use anyone else's roller rockers (non-self aligning) then you'll have to run guide plates.
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Re: ZZ4 valve cover question. (Smokehouse69)
I don't know of any tall centerbolt vavle covers, or a need for them.
You could, at big expense, use the center bolt to standard valve cover conversion kits. But at $160 just for the kit, I would have to ask "Why?"