Join Date: Apr 2000
Location: Columbia, MO USA
Re: 3914638 is it a 307?
A sonic checking device is like a sonar gun that can measure part thicknesses once it's calibrated in.
You hold it's transducer, (i.e., sending head), tight against the part, (cylinder wall in this case ), a sonic wave goes out, returns and then it is converted electronically into thousandth's of inches or whatever...
A good Machine Shop should have one, imho.. It can tell you if the cylinders are thick enough before boring to bore an 1/8" over. As well as check for thinner rust spots and even sand cast pinholes and such.
The one I've seen is like the size of an old hand-held transistor radio w/ a transducer and cord on it. Nor much bigger than a dwell meter as I recall??
And if it won't bore an 1/8" over, heck, bore her a 1/16" over and turn her into a highly HOPPED UP 292 and go big engine hunting!!