Black Baja

iTrader: (2)

That's because they have the correct valve springs.

hogie roll

That's because on average a rebuilt engine never gets more than 500 hrs or 20,000 miles. Show me a stock automotive application with aluminum rockers.

ICDEDPPL

iTrader: (1)

Mercury uses aluminum and ComCrap had a lot of issues with theirs.. that company is not what it used to be.

vintage chromoly

iTrader: (3)

There's a reason why there are multiple pages of nice used jesel aluminum rocker arms on eBay.
Anyone who uses them knows they have a finite number of hours before they need replaced.
Back when lightweight valvetrains were the norm, aluminum was king. Now the emphasis is on valvetrain stability as opposed to weight.

vintage chromoly

iTrader: (3)

What's their recommended service interval?

Black Baja

iTrader: (2)

That's sorta true. Today's theory is cam side weight doesn't matter valve side light as possible. Pro-stock still uses aluminum arms.

vintage chromoly

iTrader: (3)

I agree that comp cams is entry level performance gear. That arm pictured is a cast piece and really not more than a small step up from OE. Back story on the failure? Was too much asked of that arm? Was the setup right?

Full Force

iTrader: (5)

HAHHAHA suuuuuure!!

vintage chromoly

iTrader: (3)

I get that.
Pro stock is a completely different animal. I'm sure they cycle those arms out after a few passes.
This is an endurance application.

Full Force

iTrader: (5)

I am probably going with new heads set up by Bob M..... I know they will be right..and worse case mine were redone last summer totally also and mine are good, but want a better head.