Brian Crower BC0900SX-2 - Polaris Pro-R Beehive Spring/Steel Retainer/Seal Kit w/o Seat

Designed for high rpm, BC valve springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. BC retainers are machined from premium chromoly steel alloy for "set it and forget it" wear characteristics. Beehive spring keeps retainer lightweight. Also includes BC3991-2 valve stem seals.

Type	BC1900-2 Single
Free Length	1.610"
Seat	1.265" @ 83 lbs
Open	0.850" @ 197 lbs
Coil Bind	0.760"
Retainer	BC2901S-2
Valve Seal	BC3991-2
Net Cam Lift	0.430" w/BC3991 Seal