Head Studs and Valve Spring Combo Valve Springs:Without Retainers 1809 major differences are the PSR3584

major differences are the PSR3584 now comes with a 66mm rear wheel and stronger turbine wheels for high flow

and the only feature that rolled over from the Gen4 range was the mounting orientation

Size Operating Pressure Burst Pressure Inside dia Inch Inside dia mm Outside dia Inch Outside dia mm Weight (gm/m) Bend Radius (Inch) Bend Radius (mm) AN-6 500psi 2000psi 11/32”   8

Actual Size: 750 x 300 x76

Raceworks 110 Series 60 Degree Taper Hose End

Head Studs and Valve Spring Combo Valve Springs:Without Retainers 1809 major differences are the PSR3584Head Studs and Valve Spring Combo. The BarraTheWorld. com combo deal is specifically pieced together to simplify your build. This combo deal is perfect for people looking to add a bit more boost or converting their Barra from NA to Turbo, with the added bonus of a cheaper price! Deal includes: ARP Head Studs Crow cams upgraded springs, your choice of with or without the retainers Valve springs without retainer 1808 specifications Entry level valve