Goopy Performance Apex Seals

The Ultimate unbreakable Apex Seals from Goopy Performance.

We recommend 0.0381mm of clearance between the apex seal and the rotor slot for all applications, boosted or naturally aspirated.

3 mm 12A or 13B Goopy Apex Seals are 2.921mm thick, and you should be able to slide a 0.0381mm feeler gauge into the rotor apex slot with a new apex seal.

Our oversized 12A 3 mm seals measure 2.9972mm (+ / - 0.0254mm). If your rotor slot measures 0.4572mm - 0.508mm, you may benefit from our oversized 2 mm seals which will allow you to re-gain the 0.0381mm suggested clearance.

Our 2 mm apex seals are 1.905mm thick and you should be able to slide a 0.0254mm feeler gauge into the rotor apex slot with a new apex seal in place.

 Goopy Performance 13B 2 mm oversized apex seals measure 1.9812mm (+/- 0.0254mm). If your rotor slot measures 1.9558mm - 1.9812mm, then you may benefit from our oversized 2 mm seals which will allow you to re-gain the 0.0381mm suggested clearance.

If your gap with the seal in place measures 0.0508mm - 0.127mm it is still usable, but keep in mind that tighter clearances means greater sealing characteristics.

Take note that 12A and 13B 3 mm apex seal slots suffer the most when it comes to rotor slots over-tolerance. We have measured many used rotor slots and have found very few that still had the stock widths.