Wilwood 120-11578 Forged Narrow Dynalite 4-Piston Caliper 3.50in Lug Mount Gray

Vehicle Fitment

• Universal - Competition, Off-Road, Road Racing, Sprint, Late Model, and Modified applications with 3.50" centered lug mount spacing

Fitment Notes

• Universal caliper - no vehicle-specific OEM fitment; requires bracket or custom mount with 3.50" centered lug tabs
• Direct replacement for all previous Wilwood NDL calipers and competitive brands with 3.50" centered mounting tabs
• Compatible with rotors ranging from 11.75" to 12.72" diameter and 0.75"-0.81" wide

Features

• Stress-flow forged aluminum body realigns grain structure for maximum strength without machining interruptions
• FEA-generated radial transition design eliminates steps and shoulders between piston housing and caliper bridges for superior deflection resistance
• Five-bolt bridge design provides superior bridge strength and positive pad retention
• SRS stainless steel bridge wear plates prevent pad gouging, reduce rattle, and dampen brake squeal vibration
• Four stainless steel pistons resist corrosion and retard heat transfer from pads to fluid
• Four-corner bleed screws allow full air evacuation and universal left/right/front/rear mounting in any position
• Internal fluid passages eliminate need for external crossover tubes
• Full PolyMatrix pad compound compatibility (BP-10 through BP-45) to match any heat range or braking response requirement

Specifications

• Piston Count: 4
• Piston Bore: 1.12 in (each)
• Total Piston Area: 1.98 in²
• Piston Type: Stainless Steel
• Mount Center: 3.50 in
• Mount Type: Lug (Universal)
• Mount Hole Size: 0.45 in
• Mount Height: 2.85 in
• Rotor Width Compatibility: 0.75 in (min) - 0.81 in (max)
• Rotor Diameter Compatibility: 11.75 in (min) - 12.72 in (max)
• Pad Type: 7816 / 7216
• Total Pad Area: 6.36 in²
• Total Pad Volume: 3.00 in³
• Fluid Inlet Thread: 1/8-27 NPT
• Caliper Weight: 4.1 lbs
• Finish: Type III Hard Anodize (Gray)

Included Components

• 1x Wilwood Forged Narrow Dynalite Caliper (120-11578)

Product Description

The Wilwood 120-11578 Forged Narrow Dynalite (FNDL) is a competition-grade 4-piston brake caliper engineered for demanding applications including late models, modifieds, sprint cars, off-road, and road racing. Built from stress-flow forged aluminum, the caliper's grain structure follows the contour of the body for exceptional strength - outperforming conventional billet-machined designs. The FEA-optimized radial transitions between the piston housing and bridges significantly reduce flex and caliper separation under heavy braking loads.

Designed as a direct replacement for all previous Wilwood NDL calipers and competitive 3.50" lug-mount alternatives, the FNDL installs in any front, rear, left, or right position thanks to four-corner bleed screws and internal fluid passages. SRS stainless steel bridge wear plates protect against pad gouging and vibration-induced squeal, while stainless pistons provide long-term corrosion resistance and thermal protection. The caliper accepts the full range of Wilwood PolyMatrix pad compounds, making it adaptable to everything from street performance to high-heat race environments.