goodson has about the best price on crack repairing supplies. ive only fixed a thousand cracks with pins. on heads cracked between the valve seats , you have to take the seat out first if it has removable seats. then find the ends of the crack with magnaflux.you want to eliminate the ends of the crack during the repair so it doesnt continue to crack.so drill the end of the crack, flux it and look for the crack in the hole you drilled to be sure you got it all. pins need to be overlapped into each other and then peened as the final step. then new seats installed. the pins dont work well on thin parts of the head but combustion chamber area is usually pretty thick..lucas
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