some 350 blocks with a left or right core shift will need work on the pan rail -
if you do your own work you will have to check the rod bolts as the motor is turned in a circle -- the distance between the outer edge of the rod bolt ( nut ) and the block / at the pan rail .060 min -- also in an extreem case of core shift -- the rod bolt ( bolt top outer edge ) can hit the cam lobe of course its the 4 and 6 you need to really look at and its not easy to see -- but those for the most part are extreem cases -- but only way to know for sure is to check -- being very carefull and looking at it all will save you from doing it over -- $$$$$$$$ - jz
PS : the hole the cam goes into has an edge all the way around it == first see if the edge around the hole for the cam is centered / to the cam hole -- Thats i quick way to tell if block has shift in it -- IF you do not get what i am refering to i will photo and post up in a day or so we just got caught up today in my shop and now i have some time for things, so i can do for you if you need -- jz
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