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Old 03-05-2016, 02:15 PM   #21
Kurt in NJ
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Default Re: Size of 3/8 pistons

I am going out to play soon, i will drag it out and take some pictures ---as to a "sonic test" finding a pinhole corrosion pit I don't think so except for luck the way I saw the test being done at a local shop---3 spots on the bottom, 3 spots on the top of the bore----perhaps other testers are better but to find a 1/64" corrosion pit it looked like it would take a long time going over every 1/64" of the cylinder walls

The walls are greased. I will clean them, get better #s, perhaps I will only need 1 special piston
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Old 03-06-2016, 08:29 AM   #22
JWL
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Default Re: Size of 3/8 pistons

If you read my book you will see that I agree with your assessment of sonic testing to find a miniature thin spot. It requires several hours to grid and check a block.
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Old 03-06-2016, 11:15 AM   #23
Kurt in NJ
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Default Re: Size of 3/8 pistons

I took some pictures inside the block, I only see one of the cleanest water jackets I have ever seen in a used flathead block. This picture is showing the base of #5 and inside of pan rail
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Old 03-06-2016, 11:20 AM   #24
Kurt in NJ
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Default Re: Size of 3/8 pistons

Looking down between #3-4 --it's as if a new block was punched out to 3/8 and only run for a short time

I cleaned the bores with a rigid hone, all the bores will be good at 3/8+.002---now to see hows special that size is
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Last edited by Kurt in NJ; 03-06-2016 at 11:57 AM.
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