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Three of the most commonly asked questions we get are:

Piston to Wall Clearance:

Proper piston to wall clearance depends on the power level of the engine. Use the chart above as a guideline. Minimum clearances are fine for naturally aspirated street applications. However the clearance should be increased for higher output engines, especially with nitrous and forced induction (turbo and supercharged).

Where do I measure the piston skirts?

For the most accurate measurement place your micrometer at .500 from the bottom of the skirt 90 degrees from the pinhole.

What Makes Probe Pistons So Good?

Take a look at the Anatomy of a Probe Piston below to Find Out: