[rohrt]

I pretended to be a machinist today, and measure the bore of my .060 over 455 that had really bad blow by. I pulled the motor in 2017. Did other jobs on the car and now have turned my attention to the engine. Compression and lookdown test were done before hand.

From what I measured I think the block is junk. Just looking for a second opinion.

i purchased a 4-5" inside micrometer and a bore gauge. The micrometer was calibrated then set to exactly 4.211 and verified with a dial indicator. The bore gauge was zero'd to the micrometer. Pistons are still in. Measurement were taking 1" down, Midway down and right at the piston about 4" down.

I don't know what the acceptable run out is.

Cyl Thrust / NonThrust
1
.0006 .0001 top
.0000 -.0006 mid
.0000 .0003 bottom

3
.0011 .0007
.0009 .0008
.0009 .0015

5
.0017 .0003
.0009 -.0002
.0009 .0014

7
.0005 .0005
.0005 .0000
.0005 .0010

2
-.0008 -.0010
-.0002 -.0013
-.0013 .0006

4
.0010 -.0001
.0002 -.0010
.0010 .0006

6
.0015 .0000
.0004 -.0004
.0010 .0013

8
.0009 .0002
.0000 -.0004
.0008 .0005