GM LS3 Cylinder Head Complete.
GM Chevrolet Performance LS3 “821” Cylinder Head. Fully complete cylinder head that will fit any LS engine with a 4″ bore or greater (LS2/LS3). 68cc chamber. Replaces the 12629063 head and is an upgrade from 12629064.
- 0.550″ Lift Springs
Manufacturer Part Number: 12675871