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New topend still smokin

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I just put a new piston in,and had a valve job done on my 94 650L,now after about 100 miles its smoking,its the worse when its cold and you first fire it up,like the valve giudes are bad...but they checked out ok.Gets better after it warms up...but still smokes slightly.Only has about 140lbs. compression which seems low for a fresh bore and 10:25-1 conpression ratio.Pulled it back apart,no hot spots on the head gasket,ring end gap was good,never checked the clearence between piston and cylinder,but I did messure the bore after it was done,657cc = 101mm,it meassured 100.976mm,thats about as good as gets.Anybody got any idea?I would appreciate any input.

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