The GSC R3 is a max-effort, high-RPM profile for ported heads and methanol builds. It’s engineered to carry power where the Coyote lives on the limit, with lobe design modeled against ported Gen 4 Mustang Coyote cylinder head behavior and rocker geometry. Each set is cut from our U.S.-made forged billet blanks and finished with BLACK ISE for reduced friction and long life. DI note: the high-pressure fuel pump (DI/HPFP) lobe is kept to OEM spec for proper pump operation.

Highlights

• Profile intent: Max-effort, high-RPM for ported heads and methanol fuel combos
• Valve springs: Upgrade required (use GSC-matched springs; Ti retainers recommended)
• NA Builds require Aftermarket Intake manifolds such as the Cobra jet. 
• VCT options: Supports Active VCT or Locked phasers (see timing reference below)
• Manufacturing: MADE IN THE USA; forged from proprietary U.S.-sourced bearing-grade steel, BLACK ISE surface treatment, CNC to tighter-than-OEM tolerances
• Fitment: 2024–2026 Mustang GT 5.0L & Dark Horse

Tuning & Install Notes

• Fuel: Methanol. Gasoline/Ethanol blended fuels wont reach peak powers with this profile.
• Clearance: Always verify piston-to-valve with your exact heads/pistons/gasket stack. With OEM pistons & deck heights, the full phaser range is typically usable without clearance issues.
• Use upgraded valve springs (and Ti retainers) set to the tuner’s rev limit; check installed height and coil bind.
• Active VCT requires a calibrated phasing window; locked setups require a lockout kit and fixed timing calibration.
• See install sheet for torque sequence and procedures; prime oiling and fuel (HPFP follower inspection) on reassembly.