Kelford Cams 262/264 Degree Camshafts (264-EZ) - Subaru WRX 2015-2021The Kelford 264 EZ camshafts for the 2015 21 Subaru WRX FA20 DIT are drop in cams to suit factory valve springs. They are a good upgrade in power across the entire rev range, keeping almost OEM response. You must retain stock rev limit if OEM springs are used. The cams can also work with the Kelford KVS87 DT valve spring and retainer set to go above the stock rev limit. Specs: Intake 262 Advertised Duration Exhaust 264 Advertised Duration 11. 40mm 11.