dave-r wrote:I know you don't like Dave Hughes Eddie (and who can blame you) but I don't quite agree with you there.
I would use the Hughes ally roller tip rockers with the grooved rocker shafts. They have better oil control when set up with the correct side clearences and I would also use their 1.6:1 ratio versions as the geometry it still spot on and you are getting better lift and power for the same duration.
These rockers are really good quality and are far better than the likes of Crane and Indy etc.
In fact it is probably wise to use adjustable rockers on any cam with more than 0.450 valve lift anyway.
The Hughes rockers do not need to be cycled and checked regularly. Mine get a lot of abuse with my 6500rpm antics and I have never so much as needed to adjust them since they were fitted.
It's not that I dont "like" Dave H. it's the fact that if you have any problem or even a question of his choices he is very hard to deal with. I didnt go to him to make friends/mates,,I went to get business done and he was impossible to deal with. I also dont take kindly to being called childish names and being treated like I was "out to do him in" his quote not mine.. Having said that, and the fact that he is on a budget I suggest the stock stamped rocker set-up. Sure the Hughes rocker and shaft system is superior, not saying it's not but he only wants 500-550 HP from 500 cubes. This will be easy to accomplish with the stock stamped valvetrain below 6,000 RPM's and if he uses standard port 440 source heads, his torque peak will be around 3600-4200 RPM's depending on camshaft. Peak HP will occur about 5500-5800 RPM's well within the stock OEM valvetrain, then he could spend his money on a nice cam/lifters either a Hughes FRL,(Fast rate of lift) cam and nice timing chain, high quality gaskets, maybe some ARP fasteners, ectt Since the shaft mounted rockers 'revolve' around a fulcrum that fastened as securely as the MoPar shaft mount system, the only 'real' gain I see is with improving the rocker ratio to what the specs call for and the factory stamped steel arms fall short of the 1.5 ratio, therefore the alloy stuff has an advantage there. Another steel option is Ductile Iron Rockers from Isky, RAS, and other aftermarket sources, you can even bronze bush them for over .550-.600 lift fast ramp design cams, but he shouldnt need any of this with his build. And thats a lot of money for little gain. 5-10 HP maybe
The only reason why I went with my setup is for whats coming down the pike in the future. Race Cam, solid roller,, max wedge heads,,ectt
Sorry, but NO ONE can convince me that alluminum rockers regardless of the manufacturer,(I think Ed Iskenderian makes Hughes stuff or Probe Industries does), dont require a careful check from time to time which is why Jesel now makes lightweight steel rocker systems. When the failing point of alloy happens it's hard to detect sometimes. I guess you can guess I'm not fond of alloy rockers except for modified engines.