Advanced cylinder head resurfacing up to ten times flatter than machine shops and next day delivery at equivalent prices.For over ten years we have offered the most advanced head resurfacing technology available. Higher quality, more reliable, faster turnaround times. Abrasive lapping is superior to traditional machine shop fly-cutting in nearly every way.Benefits of cylinder head lapping:-Minimal stock removal, typically .002" to .003" or less depending on level of warping/damage-Superior flatness of .000" to .001" across entire surface of the head - no waviness in any direction or length-Typical surface finish of 30 microinches RA. Can be adjusted higher or lower depending on gasket manufacturers specs-Near scratch-free finish-No metal flakes, burs, or milling milling marks...EVER-No head disassembly/stripping requiredThe end result is a near perfect head to block sealing surface for both reliability and optimal performance.