Reply to "351C factory heads, can valve guide cracks be repaired by complete removal of the iron guides and pressing in thick-wall bronze guides?"

bosswrenchMember

Best guess- the P.O hammered new guides in from the top down, at room temp. The very thin flashing left from boring out the oem guides then cracked. Very hard to avoid if flashing is left behind. Disregard- does nothing for strength but remove broken bits as much as possible. FWIW- I drive them in from the chamber side using an air gun while castings are hot. Cut for .502 guide seals, sometimes the guides crack as well if driven from the top.

6/6/159:13 AM

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