Crow Cams Holden V8 304/355 EFI Hydraulic Roller — 4903
Crow Cams Holden V8 304/355 EFI Hydraulic Roller — 4903
Holden V8 304/355 EFI Hydraulic Roller — 4903
For improved mid/top end power. Combine with a twin cat exhaust for maximum performance
Camshaft specifications
| Supplier part number | 4903 |
|---|---|
| Engine / head family | Holden V8 with VN–VT-style cylinder heads |
| Operating range | 2000 - 6500 rpm |
| Advertised duration — inlet / exhaust | 278° / 274° |
| Duration at 0.050 inch — inlet / exhaust | 222° / 217° |
| Valve lift at 1.65 rocker ratio — inlet / exhaust | .548'' / .548'' |
| Lobe separation angle | 112° |
| Hot lash — inlet / exhaust | HYD / HYD |
Supplied contents
One camshaft. Lifters, springs, retainers, locks, seals and drive hardware are separate unless expressly included in an agreed package.
Profile-specific fitting requirements
Performance valve springs are required. Performance spring retainers are required. For an automatic transmission, Crow specifies converter stall at or above the lower end of the cam’s operating range. Fit the DG4 oil-pump gear. Crow lists the standard converter or a 2000 rpm high-stall option.
Companion parts listed for this profile
These are separate supporting components and may include alternative spring or hardware choices. BBT can check which combination is required; do not order every listed option as one package.
- CRHL8167 — Holden V8 Roller Rockers
- 4845-16 — Single Valve Springs with Damper - Set of 16
- GP304 — Holden EFI V8 Guide Plates
- 5208HR — Johnson Holden V8 Hydraulic Roller Lifters 2616HNR-16
- CS8308 — Holden V8 Timing Chain Set
- 11717-16 — Holden V8 Chrome Moly retainers for single spring - Set of 16
- CST100940 — Rocker Studs 7/16" Heads to 7/16" Rocker
- 4133-16 — Square Groove Std Height Machined Valve Locks - Set of 16 pairs
- KG819V-16 — Holden Viton O-Ring Valve Stem Seals
- DG4 — Holden V8 Oil Pump Gear
- DG8 — Holden V8 Distributor Gear
Contact BBT for any companion part without a product link.
Installation and BBT support
Confirm the actual engine capacity, cylinder-head design and induction system before ordering. The installer must check cam timing, piston-to-valve clearance, spring installed height, coil bind, retainer-to-seal clearance, pushrod length and rocker geometry. Hydraulic preload or mechanical lash must match the selected profile. BBT can help assemble the engine-specific package and arrange installation and calibration.
Product System
- Engine Parts
Vehicle Fitment
- Holden Commodore Vn Vr 5 0 Efi V8
- Holden Commodore Vs 5 0 Efi V8
Confirm chassis, engine, drivetrain and production-year compatibility before ordering.