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Old 05-09-2019, 12:08 AM   #1
CNC BLOCKS
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Default Values of Torque plate honing

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Originally Posted by CNC BLOCKS N/E View Post
This is a factory 454 block .030 that was machined by another shop. I have seen work from this shop many times and their work has always been spot on. This is a marine build went to plate hone the block and measured the cylinders they were .0035 distorted. I can not stress enough that on factory blocks plating honing is a must to achieve good ring seal. People say the rings will break in LOL I have seen circle track engines with rags around the breathers for 2 or 3 years leak them down up to 35% leak down. I have always said its best to do a leak down 40 to 50 degrees BTDC or after TDC. Here is an article I did on plate honing years ago
https://www.chevelles.com/forums/148...rlhkkkWTSDDaDo







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Old 05-10-2019, 03:20 PM   #2
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Years ago some really sharp machinists who did a lot of machine work for a fist full of NHRA stock guys insisted on the use of a torque plate (and all kinds of funky stuff with those stock guys like running 180 degree water through the block as it was being bored and honed). If I had the $$ I would get one for my 6 motors.

Thanks for posting that!
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Old 05-18-2019, 12:24 PM   #3
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No Torque Plate Honing = Much Higher Leakdown %
It's that simple..lol
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