These heads feature: 1. Silicon bronze wall helicoil that replaces the old style brass guides with solid aluminum guides that are part of the original casting. 2. Filled opposite side from plug in chamber for proper flame travel. 3. Filled under the intake ports and above the intake ports. 4. Spring cups which are also cast in to ensure captivation of the bottom of the spring. 5. The spark plug holes are angled for manifold clearance. 6. Titanium valves. 7. Titanium retainers. 8. Vasco jet springs. |