Im building a 532...Blue Thunder Heads.
Im having trouble deciding on Rockers.. let me go a head and throw out the fact that i dont want to do shaft mount rockers...the Springs im going to run are Comp 947-16, with a O.D. of 1.645. they also have a pretty heafty open pressure. Comp told me today on the phone that the Ultra Golds will bust in half, due to too high spring pressure. and two seperate Tech's at Comp have suggested to run the 1830-16 - Ultra Pro Magnum XD.... but i dont feel like spending $400 on a set of rockers, and then have to modify them.. Let me know what yall think.
I think that when it comes to custom engine building, parts detailing and/or modification is often the norm and that includes releiving rocker arm bodies.
Currently, there are a lot of cheapo rocker arms on the market and thinking with your wallet instead of selecting parts based on quality can effectively destroy your exotic engine in the blink of an eye. A lot of parts suppliers these days sell components that they do not manufacture and you really need to know the part's origins and actual make-up, and you'd be suprised who some of these big name suppliers are...and how cheap their parts really are.
Then there's the matter of good design geometry for the 385 Series engine, and of which most every stud rocker arm that is made today is a compromise for its poly-angle cylinder head...but I won't get into that now.
In your particular case I would select a good steel rocker arm body, and that might be the Comp 1830 that Lem suggested or the Crower 73615. Not only are the Crower's expensive but that price does not include poly-locks; no matter as you should be running a stud girdle (with the stud girdle's proprietary poly-locks) anyway. There are some good aluminum ones out there, too.
P.S.: Beware of rocker arm manufacturers that will not disclose exactly
what grade material they are using in their rocker arms. There are a number of them--including some american manufacturers--that are using what I (and other rocker arm manufacturers) consider to be an ultra-low grade of aluminum that was developed for an entirely different application and which makes the rocker arms innapropriate for use in big springed engines such as yours. Most of these manufacturer's offer a "lifetime warranty" on their rocker arms so as to imply
(and in effect, mislead) that their rocker arms are strong, but in reality when your engine grenades due to their failed rocker arm they already have your money and they lose nothing except for handing you another rocker arm and they have fulfilled their obligation with you. Pesonally, I'd much rather have true, top-of-the-line rocker arms with zero warranty.