Pissed Off? Huh?, I think the 38 has a meaner idle,

abones id send them to jesel they disassemble and reshot blast to add strength its a fast great service i never would have known except for a weird feel when spinning the shaft while in my hand i thought they were ok and they looked ok

Sup! How many hours did you have on them before sending in? I’m still watching your vids.

not a lot of hrs but when we ran it we ran it hard Blackcloud was never a cruise around boat it was always hardcore bad old hot rod!

I agree, and it's been said over the years that a BBC's biggest weakness is the valve train---and when it comes to stud mounts vs shaft mounts 2 legs are better than one if your budget allows..I really like the idea of a steel shaft mount roller rocker arm set-up----no stud girdles, no push-rod guide plates either. You just integrate the cost of the girdles and guide plates into the cost of shaft mount rockers. And I also like the idea of steel vs aluminum for strength, durability, dependability, and longevity reasons as well.

Aluminum body rockers are measured in cycle time for fatigue. steel basically go forever comparably. so considering the added cost its worth it. you can send the steel rockers back to have them rebuilt for a fraction of the cost of buying a new set of aluminum body rockers after about 150-200hrs. I have 4 sets of T&D of aluminum bodies with about 80hrs on them. Now i run steel body

What CI and lift / duration?

TECH: On engines with a higher average rpm and power band the stock oil flow thru the valve train can be marginal at best. This is a very common cause of premature wear and escalating oil temps. Most conditions on endurance applications such as performance boats or off shore race boats plumbing a separate pressurized spray bar to cool valve springs and rockers that feeds from either a passage in the block or a separate oil supply has proven to be extremely key to long term durability, because the rapid cycling torsional stress on valve springs can easily cause them to heat to over 700F if not bathed in a constant flow of oil that absorbs and carry's away the heat that builds up rapidly, many shaft rocker systems have strategically located oil shaft holes that direct flowing oil to the valve springs and rockers. Most people don't understand that almost 1/2 of an engines total heat comes from the valve train and bearing friction.
copied from grumpy's performance garage.

How much of that heat gets transferred to your rockers? How much does that effect the cycle time of aluminum?

Has anyone ever seen a broken steel rocker ?