Comp Cams FORD 3.8L-4.2L STEEL RETAINER 4G4RBF Thumpr 279TH7 High Performance Street

Thumpr 279TH7 High Performance Street

Upgrade your Wrangler JL Unlimited with Artec Industries' sliders

Duration: 260 Intake / 260 Exhaust

but the heavier coils in front

The Front Frame Gussets are designed to add extra strength and bracing to this area so you can run your aftermarket bumper with confidence

Comp Cams FORD 3.8L-4.2L STEEL RETAINER 4G4RBF Thumpr 279TH7 High Performance Street7 Steel Retainers: Stock Spring Dia. Valve springs with larger diameters require retainers to handle the higher pressures developed by the springs. New COMP Cams Steel Retainers are the perfect solution to this problem. COMP engineers used 3D CAD with FEA to design retainers with a modern and advanced contoured top profiling for lower stress, increased lift and a reduction in mass. The retainers are CNC machined to exact tolerances using CAD CAM