Hemi Valvetrain And Head Upgrades - Superior Solutions - Tech:
The stock 5.7/6.1 parts are high quality, but the beehive valvesprings can fail when teamed with hotter-than-stock aftermarket cam profiles. The 5.7's factory installed springs are rated at a healthy 260 pounds (SRT8 is slightly more). But both coil bind at about 0.550-inch lift and cannot be teamed with higher lift cams. View Related Article