Punch out the Valve Guides 1. Drill valve guides with a 12 mm (0.427 in) drill to loosen in their seats. 2. If a heating oven is available. the guides need not be drilled but, instead, the head heated to approx. 180 deg C (356 deg F), 3. Using a punch of proper size (see illustration), drive the valve guides out towards the combustion chamber, |
