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Starlifter (1/26/2019)
....If it looks like it can be saved then I may look for a 272 crank.[If planning on having the rotating assembly balanced, go with a 292 crankshaft as the counterweights are heavier than those on the 272 and will be easier to balance. Many of the newer replacement pistons are heavier than the originals so having a heavier crankshaft leaves it more open to drilling on the counterweights in order to balance it rather than adding weight to the crankshaft.
  Lorena, Texas (South of Waco)
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Last Active: 5 Years Ago
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Excellent advice sir. Now I just need a little luck with the clean up of the block and cylinders. IYO what is the max on cylinder bore on a 256 block?
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Group: Administrators
Last Active: 4 days ago
Posts: 7.2K,
Visits: 202.7K
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Starlifter (1/27/2019)
Excellent advice sir. Now I just need a little luck with the clean up of the block and cylinders. IYO what is the max on cylinder bore on a 256 block? For most Y’s, 0.060” over is generally considered safe. If considering more than that, then sonic testing is highly recommended to get a feel for actual cylinder wall thicknesses and what the core shift looks like. There are quite a few 272 blocks out there that have been bored 0.125” over to make them standard bore 292’s but not everyone of those was a successful high mileage engine. Sonic testing opens up the option to offset bore the cylinders so that the cylinder wall thickness is more uniform all the way around.
Lorena, Texas (South of Waco)
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