Reply to "dyno of 351"

panteradougMember

All you need to know is the clearance at maximum lift and the piston at top dead center.

The valve is no closer to the piston at any other point. You don't need to know the clearances at any other point so what is the point of graphing the lift "curve"?

I don't get it?

Unless you are using piston blanks from another engine or machining them down out of a solid piece of aluminum billet, ALL pistons are going to have the valve reliefs cut into them.

The manufacturer can tell you the maximum lift of the cam that you can use with them before you need to flycut the valve reliefs.

Even so, that usually is because you are going to a much larger valve outside diameter then the enging ever was built for.

5/23/187:22 AM

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