S&S Cycle SS33-5076 561V Camshaft for Evolution Big Twin 84-99S&S Cycle 561 Camshaft Works in all displacement Big Twin V2's with a variety of compression ratios Ideally suited for stock to 88 engines with up to 11: 1 compression, 96 engines with 10: 1 and 98 engines and larger engines with no greater than 9. 5: 1 compression Moderate duration makes for great mid range performance Supplied in many S&S Engine and Hot Set Up kits Made In The USA Product Specs Duration Intake @ . 053: 252 Hydraulic or Solid: