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PostPosted: Wed Apr 03, 2019 11:57 am 
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I found online an ultrasonic check form from T. Meyer (I think it was from a Cleveland block? min. thickness measured 0.098”, 0.105”, 0.110”). What figures would indicate a good block which can be bored over without any problems?

I just checked some blocks, here are the three lowest measurements, all are found in the middle of the cylinders:

D0AE-L, 2 bolt block, 0.020" over: 0.150", 0.154", 0.157"
D1AE-J, 2 bolt block, STD: 0.169", 0.173", 0.177"
D2AF-CA, 4 bolt, STD: 0.165", 0.173", 0.181"

What have you measured?

Thanks - Ralf


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PostPosted: Wed Apr 03, 2019 12:20 pm 
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Check it about 1 inch down from the deck non thrust where two cylinders are adjacent. I think you'll find it to be at slightly less than .100 with a standard bore on most all cylinders. Personally I think that .075 will work just fine in this area. Be sure to calibrate your tester on the block that you're currently testing.


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PostPosted: Wed Apr 03, 2019 1:42 pm 
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I've had two recently that were .050" thick in the area where Dave was talking about. One was standard bore, one was .030" over. I ran them both. Hard.

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Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


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PostPosted: Thu Apr 04, 2019 10:29 am 
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Thanks Dave and Brent.

I have measured each cylinder 12 times (at 3, 6, 9 and 12 o'clock position each time on top, middle and bottom of the cylinder bore).
The above mentioned lowest figures are in the middle on non thrust side where two cylinders are adjacent.
So my figures are pretty good :)

Cheers Ralf


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PostPosted: Sun Apr 07, 2019 12:08 pm 
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1973Mustang wrote:
Thanks Dave and Brent.

I have measured each cylinder 12 times (at 3, 6, 9 and 12 o'clock position each time on top, middle and bottom of the cylinder bore).
The above mentioned lowest figures are in the middle on non thrust side where two cylinders are adjacent.
So my figures are pretty good :)

Cheers Ralf


They are good numbers but maybe too good. Did you calibrate your probe on your block?


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PostPosted: Sun Apr 07, 2019 12:33 pm 
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Location: Graham, Washington
1973Mustang wrote:
Thanks Dave and Brent.

I have measured each cylinder 12 times (at 3, 6, 9 and 12 o'clock position each time on top, middle and bottom of the cylinder bore).
The above mentioned lowest figures are in the middle on non thrust side where two cylinders are adjacent.
So my figures are pretty good :)

Cheers Ralf


I am no engine building professional but just tested one of my own. The best number between any two cylinders was .122, most were at or below.100 with the lowest being .075 on a .030 D2 block. I tried to validate my measurements with the appropriate wire gage sized drill bit fit between the cylinders through the freeze plug hole, then add that to the measurements from either side. Most came out pretty close.


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PostPosted: Tue Apr 09, 2019 12:39 pm 
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Yes, I did calibrate my probe with the included calibration block of the measuring equipment, changed the ultrasonic speed to the figures for cast iron and checked on a part of the block where I could use a caliper.

Cheers Ralf


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