VHM Cylinder heads are available for most high performance two strokes. All VHM inserts come with a piston protrusion measurement that the head is machined to. Using the tool you simply set the squish by the amount the piston sticks out of the top of the cylinder. This save the hassle of using solder and is really accurate allowing a small amount of adjustment, or ensuring your bang on every time you change your sometimes not so bang on pistons. You also ensure you have constant port timing on your cylinder.
If you run different cylinder heights
