The Edelbrock part 77219 Victor 15 Deg Small Block Ford 240cc cylinder head is designed for maximum effort competition racing on 289 - 351 cubic inch based engines. The inline valve configuration features a 15 Deg valve angle and a modern combustion chamber design allows for high compression without large piston domes. The intake ports are raised .380 however the intake flange has been extended to maintain proper port alignment with standard intake manifolds. The exhaust ports are patterned with a 2.50 spacing and raised .520 for high flow potential. This head requires shaft mounted rockers please contact Jesel or TD for details. Features include 47cc combustion chambers, ductile iron interlocking valve seats, manganese - bronze valve guides and requires professional preparation. Edelbrock recommends 2.125 intake valves and 1.625 exhaust valves with 5.45 overall length.