I've had 3 blocks bored from the 040 to the 090 sleeve. The machinist is familiar with the N engines and has done many dozens of such jobs. One of my blocks had a split wall in the 040 bore, and he bored it 125 to take a heavier sleeve. He felt that that motor would be good for another 30 or 40 years.
At the Ford tractor dealer shop, every thinwall engine they rebuilt was bored to accept the 090 sleeves. They probably did hundreds of jobs.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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