Edelbrock Power Package Toppower Package Top End Kit RPM for 383-427 SB Chevy (1957-86) 460+ HpEdelbrock part #2093 Performer RPM Top End Kit is designed for 1957 86 Small Block Chevy 383 427 V 8 engines. This Top End Kit produced 460 HP & 460 TQ on a 383 c. i. d engine with 9. 5: 1 compression. The kit delivers improved performance in street applications from 1,500 to 6,500 rpm range. This kit includes RPM Air Gap intake manifold, E Tec 200 cylinder heads, pushrods and Rollin' Thunder Hydraulic Roller camshaft, timing chain, complete bolt kits