78 thoughts on “ JB Weld Fixes Cracked Cylinder Heads ” ... But “Ultimate test” ? A crack is very different to a cut. Cracks can propagate and have to be specially treated.

We have a healthy 440-based Max Wedge engine and came across a hairline crack. ... Cast Iron Cylinder Head Repair - Cold Stitch Crack Repair. Save That Rare Iron. HOT ROD Staff Writer Jan 26, 2012.