Yella Terra Platinum Race Rockers
SBC - SKIP WHITE NKB 274 - WITH WIDE PORT OFFSET P/N NKB 274
CHEVROLET SMALL BLOCK V8 PLATINUM 1.6 SHAFT-MOUNT ROLLER ROCKERS – SUITS SKIP WHITE NKB-274 HEADS WIDE PORT
Designed for Strength. Built to Race. Yella Terra’s Platinum Series shaft-mounted roller rockers are now available specifically to suit the Skip White Performance NKB-274 200cc Small Block Chevrolet alloy cylinder heads. Designed for serious street, strip and competition engines, the YT 6340 WP replaces individual stud-mounted rockers with a rigid common-shaft system.
This provides greater rocker stability, improved load distribution and reduced valvetrain deflection at higher engine speeds and spring pressures. The wide-body rocker arms are CNC-machined from heat-treated, aircraft-grade aluminium extrusion, providing exceptional strength while efficiently dissipating valvetrain heat. Heavy-duty 7/16-inch mounting hardware secures the shaft assembly firmly to the cylinder head.
Oversized full-complement caged bearings operate on precision-ground trunnions to reduce friction and maintain accurate rocker movement. Hardened chromoly steel roller tips minimise valve-stem and guide wear while delivering smoother operation and more consistent valve control.
Why Choose Platinum?
- Wide body arms for greater strength and resistance to deflection, extruded from aircraft grade aluminium for the highest RPM potential. Built to withstand 900lbs* max open spring pressure
- Oversize full-complement caged bearings designed for oscillating (rocking) loads, paired with oversize precision ground trunnions to reduce friction.
- Intricately balanced CNC billet arms ensuring vital valvetrain stability - focusing attention on the harmony of the entire engine.
- Single shaft bolt-on also available for cantered valve cylinder heads.
- Extruded from aircraft grade aluminium, perfect for dissipating excess top-end heat.
- Proven bolt-on shaft mount design that mounts both inlet/exhaust to common shaft, effectively increasing footprint and clamp load twofold without any further cylinder head modification.
- Various ratios available, catering for every camshaft grind. High ratios allow for additional lift on stock and aftermarket camshafts.
- Chrome moly steel hardened and ground roller tips of generous diameter (positively retained by internal circlip) preventing abrasion of valve tips and guides commonly seen with non-roller tip rockers. Allows for smoother, quieter operation Maintains lash and reduces necessary and tedious engine maintenance.
ITEM SPECIFICS
| PART NO | YT 6340 WP |
| BRAND | PLATINUM |
| APPLICATION | RACE/STRIP |
| MAX OPEN SPRING PRESSURE |
900lbs |
| MAKE | CHEVROLET |
| ENGINE | SBC 265, 267, 283, 302, 305, 307, 327, 350, 400 |
| MOUNTING STYLE | SHAFT MOUNT |
| ROCKER ARM RATIO | 1.6/1.6 |
| CAPSCREW SIZE | 7/16" |
| ADJUSTABLE/HYDRAULIC | ADJUSTABLE |
| ROCKER ARM STYLE | FULL ROLLER |
| ROCKER MATERIAL | ALUMINIUM |
| ROCKER ARM BODY STYLE | STANDARD |
| ROCKER ARM NUT STYLE | CAPSCREW |
| MAX SPRING DIAMETER | 1.550" |
| INLET OFFSET | EXTRA WIDE PORT- Rocker have offsets |
| QTY | SET OF 16 |
| NOTE |
STUD CENTRES: 1.770"
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