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Barring an angle guage,90 degrees is a quarter turn. You can judge your starting and ending points and just turn it a quarter turn. Another method I have used is to dab a bit of paint or nail polish on the bolt heads, and use that as guide for a quarter turn.

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โˆ™ 2005-11-28 02:12:42
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Q: After torquing the head bolts to 33ft lbs on 1995 Chevy 31 how do you measure for the 90 degree turn they call for?
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