We are proud to release our new MAP valvetrain components for the 4G63. No other company offers you the quality and craftsmanship we do for the money, period.
MAP beehive valve springs are engineered to exacting tolerances utilizing only the finest materials by an ISO certified valve spring manufacturer. Designed with performance in mind these valve springs are ideal for camshafts that feature more aggressive lift and duration profiles.
MAP beehive valve springs utilize ovate shaped wire that more effectively distributes stress over the entire wire area in comparison to a typical round wire spring. The thinner cross-section wire also allows for more coil bind clearance to accommodate higher lift camshafts. Retainer end mass is reduced allowing for improved performance in high RPM applications and coil surging is dramatically reduced providing improved valve control and fatigue life of the spring itself.
This particular kit includes a complete set of 16 valve springs only as they were designed to utilize the factory Evolution 8 & 9 spring seats and retainers. If valvetrain stability is your primary concern, replacing your factory springs with these alone is more than sufficient for the majority of our customers. However, a complete kit with titanium retainers at an additional cost would further reduce valvetrain mass if that is the intent.
These valves feature an undercut stem in the head area. In addition to reducing the valve weight (which provides benefits in opening rate and RPM limits), the radius of the head is such that it significantly improves air/fuel flow. They enjoy great success when used with stock heads, as well as modified versions. Fully swirl polished. Chromed stems and Stellite tips. As an added feature we have had our valves [B]black nitride coated[/B] to add even more value for our customers!
*Includes 8 intake valves and 8 exhaust valves (1 complete set)
MAP’s dual valve springs are precision wound from only the purest, high quality chrome-silicone materials for the demands of today’s high revving, extreme boosted sport compact engines. Our springs go through many QC stages to ensure a great piece every time.
*Includes a complete set of 16 springs, retainers and seats.