Based onC26 low profile with unique air gap, air gap cooler and denser mixture for more power, 1.625 in. taller than low-profile PN[5425], also available in endurashine finish PN[75254], also available as complete kit PN[2025/20254], best when matched with Edelbrock 500CFM carburetor, use fuel line kit PN[8088/8091], use progressive throttle linkage kit PN[7094]