White_LightningZ

iTrader: (1)

My stock 97 561 castings make peak flow at .450 lift (224cfm) and the low goes down 3-4 cfm for every .50 increase in lift. They are still flowing better than the older castings but with the older castings an increase in lift is accompanied by an increase in flow.

So, for optimum tq/hp should I set my lift to .450-.460? I guess I could use my stock rockers and springs lol my valvetrain is young but that is not my intent.

GIZMO

iTrader: (8)

Stock Eliminator motors run factory lift and several LT1's are in the low tens. The down side is that you have to run a bunch of duration to get that kind of performance (25X/26X @ .050). You need to buy valve springs to match the cam. I have run factory or Crane replacement rockers for years without failures.

Daren

blkchevyz

im no cam expert by any means, but i think you want to have your cam lift a little higher then your peak flow numbers. that way its hitting the peak when its opening and when its closing.

White_LightningZ

iTrader: (1)

yeah that is what I thought too. Something to do with the flow dynamics.
How much more lift over peak though?