You might want to deck the head again. It shows where you had a blown head gasket, which may be related to the head being warped. Also it would not hurt to take a head bolt and run it into the two closest bolt holes on the block to make sure the bolt can go all the way into the hole to bottom and both holes are the same depth.
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John
Proud Owner of a Model 100 and a Model 124.
A homemade cart, 2 x 42" mower decks, a 38" deck,
a 42" front NF blade, and a lawn sweeper!
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