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johnneilson · 05-31-2023, 05:23 PM

I have done stitching on blocks in a few places.

As Brent has mentioned, it requires base material to be present and not in a highly stressed area.

The concept is to install a threaded tapered iron plug into a crack or next to a crack, cut it off and peen slightly. This is done in an overlapping sequence along the crack.

In some race motors where the crack travels from the valve seat to the bore it has been done successfully by sleeving the block first and then stitching into the sleeve and into the valve pocket. It is also advisable to have a couple different size pins and taps available.

John

05-31-2023, 05:23 PM	#11
johnneilson Senior Member Join Date: Jun 2010 Location: 34.22 N 118.36 W Posts: 1,066	Re: Metal Stitching my Block I have done stitching on blocks in a few places. As Brent has mentioned, it requires base material to be present and not in a highly stressed area. The concept is to install a threaded tapered iron plug into a crack or next to a crack, cut it off and peen slightly. This is done in an overlapping sequence along the crack. In some race motors where the crack travels from the valve seat to the bore it has been done successfully by sleeving the block first and then stitching into the sleeve and into the valve pocket. It is also advisable to have a couple different size pins and taps available. John __________________ As Carroll Smith wrote; All Failures are Human in Origin.