S1
- SKU
- GSC7073S1
- Intent
- Street/Strip + NA road course
- Fuel
- Pump / Race / E85–E90
- Advertised Duration
- 290°/IN 300°/EX
- Duration @ 0.050"
- 232°/IN 244°/EX
- Max Lift
- .551"/IN .551"/EX
- RPM Band (Peak)
- 5,000–7,700 (≈7,500)
- Valve Springs
- OEM OK (NA/SC); Turbo → GSC springs
- Head Type
- OEM-port heads
- DI Pump Lobe
- OEM geometry retained
- Notes
- VCT retained; drivability priority