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Hello am regrinding my vavles. What angle should i go at
 

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depends alot on the particular cam grind your using. Many shops will attempt to just do a standard angle job which has through time produced peak flow numbers. Only problem is those flow numbers are generally from V8's whose cams lift well over half an inch, Dseries cams in the most extreme form don't exceed half an inch at peak lift. Low lift flow is where you spend most of your time and this is where the focus should be. Look into a wider backcut and see what you can pull out of the specialty shops like Endyn and Alaniz. They have done alot of research here on the bench and using other methods, thier knowledge of these heads are worth the extra money you spend.
 
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