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I was told the rockers are the same. Just pedestals are taller.

.650" might keep it from being an ultimate race head, but they are pretty good for a factory casting. The 6.4l heads can be had for $1500 complete, flow 340cfm un ported, use stock rocker arms to 8k rpm(drag pack guys), have a factory block that can take 1000hp, and a 6.1L crank can keep up at that power level for a few hundred bucks.

Pretty hard to beat for most guys.

Steff's 6.1l headed motor made 780hp on pump gas with a hydraulic roller. The lift can't be holding them back too bad.

I'd take a $1500 340cfm head at .650" over a $3500 330cfm indy at. 750" all day.... Lol



330 on who's bench?
Maybe with a 4.25 bore fixture.LOL
Castings are much better quality too!