S&S Compression Release Kit
  • S&S Compression Release Kit - Electric Compression Release Kit
  • S&S Compression Release Kit - Manual Compression Release Kit

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S&S Compression Release Kit

If you built a big monster of a motor, you want it to destroy the pavement, not your starter. S&S Cycle's compression release system eliminates high compression starting problems. Designed exclusively for S&S cylinder heads, the compression release system consists of a small valve that opens during starting and allows a portion of the cylinder pressure to escape into the exhaust port. The reduced cylinder pressure makes it easier for the starter to turn the engine.


  • Available in electric or manual styles for S&S heads that accept compression releases
  • Electric compression releases open when you press the start button and close when the button is released
  • Manual compression releases are opened manually and close when the motor starts
  • Kits include the required parts for installation
  • Thread pitch is 10mm x 1.0mm
  • Made in the USA

Fitment Notes & Exceptions

This is a universal fit part; it may or may not fit without modification.

  • Not for use on OEM heads
Product Style RevZilla Item # Manufacturer Product # Availability
Electric Compression Release Kit 959918 90-4915 In Stock: Ships within 24 hours
Manual Compression Release Kit 959919 90-4925 Out of Stock


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rebuild up to 99 113 s&s. needs compression releases. does installing electric ones require any speacal tools ?
A shopper on Jan 18, 2017