Max Lobe Ramp For Solid Flat

goldmember said

I'd guess you'd need pushrods about 3/4" diameter and ceramic lifters along with 550lbs open if you want to spin that over 5500rpm. Your questions should be to someone with experience with this combo as someone dealing with typical stuff and giving lobe recommendations based off other engine combos will be of no use. Have the heads been on a bench? Post up those details,might help with the other side of this puzzle.

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I don't often agree with goldmember - but I do in what he's posted thus-far with the exception of pushrods and ceramic lifters. Dynamic compression is a result - a variable. You can try to predict it and that can be used as an aid to parts choice but when push comes to shove it's not an absolute that indicates power in and of itself. I am a big proponent of using it but it's no more valid than a head flow number as far as power production.
I don't think pushrods will be quite the problem - the inherent harmonics in the straight six will negatively affect things way more than flexing pushrods once we get into any rpm where it will make power - and that's assuming the head can be worked enough to feed the cylinders. I think under 5500rpm the worst issues will be head flow and rocker setup. There's no way I'd consider the stock, shaft mounted, stamped & welded steel rockers as a performance part. They might have survived some racing, but they are not a race peice. So it's there where I think the money will need to be spent.