They tend to warp and leak due mainly to the engine running too hot, whether it be clogged cooling fins or lean mixture. They also will warp or even melt if the head gasket blows, requiring them to either be welded back up and then sanded down or entirely replaced.
Essentially keep your cooling fins clean, mixture slightly rich (make sure the throttle shaft doesn't have too much end play either), and keeping your head bolts tight to spec should prevent any warping and leaking from excessive heat.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147 R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)
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