I put 4 1/8" pistons in my SMTA a couple years ago. The block didn't need bored but he's talking about putting 4 1/8" in an M block. The M block will need bored for that. Original pistons for an M were 3 7/8" and the over size piston for them was 4". SMs were 4" with the oversize being 4 1/8".
Back in the day some guys put 4 1/8" pistons in an M block by not using a sleeve and just honing the cylinder walls really good. That was considered the last overhaul.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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