NEITHER of these things are what you want when you increase lift.Īnd a mile of valve lift is not always a good thing. Re: rocker arm ratio/geometry and head shaving in reply to Drew, 09-14-2009 18:01:08ĭrew said: (quoted from post at 18:01:08 09/14/09) What?Ī) Add weight to the valve train by making the valves longer.ī) Reduce the valve spring seat pressure because you want to increase the installed height. If the geometry gets jacked with, like when someone goes butchering the cylinder head trying to make compression and then goes cobbling shims under the stands to "make it work", it can effect valve lift. That is the point I was trying to make in my original post. youre right shaving the head doesnt effect lift on the cam but if rocker arm geometry is off a 1.5 rocker ratio could be a 1.45 which would affect net valve lift. When set up properly, the end of the rocker will actually roll across the top of the valve stem. Geometry is the angles between the pushrod, rocker arm, and the valve stem. A taller lobe on the cam, or a longer rocker arm, will increase lift. MLPANKEY said: (quoted from post at 09:28:40 09/16/09) scot in pa said: (quoted from post at 16:15:31 09/15/09) Shaving the head doesn't change the valve lift. Re: rocker arm ratio/geometry and head shaving in reply to MLPANKEY, 09-08-2009 17:59:55
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