I'm getting close to switching to a roller cam in the big block!

[qkcuda]

I ran Crane golds on my stroker which are unbushed, and never a problem. I did buy a set of those stainless rockers a long time ago, and sent them back due to poor quality, pit marks on the rollers.

 

[Curiousyellow71]

What you have are very good rockers they have the same load rating as HS rockers. I believe HS can handle 900 lbs springs standard or HD the series is rated for 1000lbs. I believe mopars are rated HD. Those mancini's are designed and manufactured by Harlan Sharp and are similiar in design as the old faithful cranes rockers made in the USA. When crane stopped making theirs, mancini stepped up and filled a void in the market. Hughes also has similarly designed rockers for high spring rates.
PRW rockers are made in China and designed here. They do look like they are pretty good quality, and someone else would have to chime in on stainless steel rocker fit on a edelbrock rpm heads. Its not a combination we have done.
Aluminum rockers can give up over time if you are pushing them racing w high spring pressure's. But with most solid cams they will last a very long time as they don't see much load. A hydraulic roller isn't stressing much either when you are talking about a rocker rated to handle a 1000 lbs spring.

 

[not so famous bob]

They make cast iron roller cams? How do they hold up to the steel roller lifters? It would def solve the distributor drive gear issue.

hughs engines =melonized steel gear on a billet roller , been running one for about 13ish yrs, ...