Drag Race and Marine 1.525 Valve Spring Kit - Solid Roller LSX - Polished1. 525 OD Fully Polished Dual Drag Race Valve Spring & Titanium Retainer Kit Utilize all the valve spring space that Mast Motorsports Cylinder heads offer! Choose the dual drag race valve spring kit that pros use. Mast Motorsports designs all of its cylinder heads to accommodate a professionally sized racing valve spring. No more trying to cram a valve spring into your LS spring pocket, which may prove to be inferior. Kits Comes Complete & ready to