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why is that? when you set valve lash 90*'s at a time starting at TDC ???



Thats book learnin... If the you check the intake just as the exhaust starts to open & check the exhaust as the the intake is almost closed you are 100% assured the lifter your checking is on the base circle....

Grab a camshaft & look it over you'll see why this method is more accurate than the book method..