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Valve Machine Angles
I'm getting my guides replaced and valves trimmed this weekend. The porsche spec book calls for three angles 30 deg. 45 deg. and 75 deg. The Haynes book references 35 rather than 30. I assume the spec book is the preferred reference.... Right???
The Haynes book also gives a procedure that says to take the 45 cut first followed by the 75 then lastly the 35/30 until the proper seat width is achieved. What is the proper seat width?? Intake 1.3MM / Exhaust 1.5MM plus or minus 0.1MM on each??
Anybody ever had to replace inserts if the machinist went too far??
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78 911SC
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